Computer viruses are unwanted computer programs that can invade your hard drive and cause many different types of damage. Usually viruses are created when someone writes a computer program and embeds harmful software within that program. As soon as other people begin downloading that infected program onto their computers, the virus finds it’s way in and negatively alters information stored in the computers. Not one computer virus is alike, there are millions of diverse programs that cause varying amounts of damage to a computer.

Just like human viruses, computer viruses spread rapidly as soon they are created and computers are exposed to the ‘infection’. Although instead of traveling through the air, computer viruses disperse themselves all over the internet, sometimes you can get a virus just by clicking on a certain webpage. Many of times computer users will have a virus in their computer for a long period of time before it is detected or before it starts causing greater damage. Even when you have anti-virus software in your computer, it will not always find every virus because the anti-virus software can only find threats already known through that program’s database.

You may ask, Why would someone create such counterproductive programs?

Well, there may not be an exact answer as to why humans knowingly create computer viruses other than to get some sort of revenge or to challenge their skills. No one will be able to prevent those people from creating viruses and exposing other computers to infection, the best thing for computer users to do to prevent such invasion is to use current anti-virus software and be cautious as to what sites they visit and what files they download.

When a virus finds it’s way into your computer, it will hide in your hard drive and rapidly duplicate itself just like virus cells do in humans. You may not be able to tell, but every time you save your data, you are also saving the virus. Soon enough the virus has multiplied to such a great extent that it damages your data and causes major problems.

Although the computer’s ROM (Read Only Memory) will not be affected by a virus, the RAM (Random Access Memory) and your computer’s disks will surely be damaged. So if the virus is only in the RAM data in your computer, when you shut the computer down the virus will be lost as well as any other memory that had been held in the random access memory (RAM).

Unfortunately if the computer virus is on your hard drive or computer disk it will remain in the computer after you restart it and it will be there whenever you use the program again. If you switch from the infected program to another program without shutting down your computer, the virus will then attach to the other program. With that happening, that virus will slowly go through infecting all of your computer’s programs before you have a clue that you computer is infected.

Currently, millions and millions of dollars are spent on efforts to protect computers from viruses and eliminate destructive virus programs.

Anti-virus programs offered by commercial and shareware sources were made solely to detect and fix programs that may be virus infected. These programs should be used to scan for viruses every time you put a disk into your computer and every time you start up your computer.

Losing data from hard drive in such situations creates big problems for your business. So, you need to restore data from the latest backup to prevent data loss. However, in case backup is not updated or available, Linux Recovery solutions come to your help.

When you face boot errors, your Linux system refuses to boot properly. There are various types of boot errors, depending upon the type and cause of failure. One such error is SCSI CRC error. You may come across the below error message when your Linux operating system loads:

“Creating Root Device

mounting root filesystem

(scsi:0:0:0:0) CRC error during data-in phase

(scsi:0:0:0:0) CRC error in intermediate CRC packet

scsi: aborting command due to timeout: pid 0, scsi 0, channel 0, id 0, lun 0 read (10) ……”

The above error halts Linux boot process, making your hard drive inaccessible. To retrieve lost data in such cases, identify the problem and perform Data Recovery Linux by resolving it.

Cause

On the first appearance, this issue seems to be associated with hardware problems, but this is not the case. You may face this behavior due to any of the below reasons:

• Damaged or missing /boot directory from Linux operating system installation.

• File system error or corruption.

• Missing or corrupted initrd.

/boot directory is a major component of Linux operating system, which contains critical information about booting parameters and process. While initrd is a temporary data structure, which makes preparations before mounting of root file system.

Resolution

Use Rescue CD of Linux operating system to overcome this problem by restoring damaged /boot directory and initrd. When it fails, go for Linux Data Recovery software to retrieve lost data.

The Linux Data Recovery applications are able to scan damaged Linux hard drive and extract all lost data from it. They have read-only conduct on the drive to ensure safe recovery, without modifying original data on the disk.

Stellar Phoenix Linux Data Recovery is the most comprehensive and advanced utility to ensures absolute recovery of lost data. The software works well with all major distributions of Linux operating systems, such as SUSE, Debian, Red Hat, Ubuntu, and Fedora. It recovers data from Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file system volumes.

Are you unable to boot your Windows 7 or Windows Vista operating system-based computer, after making it dual-boot with an earlier version of Windows operating system? Do you encounter error when your system tries to read disk? This behavior of Windows may occur due to various compatibility issues and make your system unusable. At this point, you can not access your hard drive partitions and encounter partition loss situations. In order to recover lost partitions in such circumstances, Windows Data Recovery is required.

As a practical example, you may come below issues after installing an earlier version of MS Windows on a Windows Vista or Windows 7-based machine in dual-boot configuration:

Windows Vista does not boot after making your system dual-boot. Only earlier version of Windows boots up.

When you install an extra instance of Windows XP on a system, which has Windows Vista and Windows XP in dual-boot configuration, the below error message occurs.
“Disk read error has occurred.”

This behavior make your system inaccessible. To recover lost partitions in such cases, it becomes essential to find the cause of this problem and perform Windows Data Recovery by sorting it out.

Reason

This behavior of Windows operating system occurs as earlier versions of MS Windows are not compatible with Windows Vista boot method. Vista employs a new BCD (Boot Configuration Database) store. The BCD includes a boot menu and the information about the operating system, which are installed on your computer. Thus, the Boot.ini file which is from earlier version of Windows can not be used for booting up Windows Vista.

Resolution

You can try out the following things to work around this problem:

Use the Bootsect.exe for restoring Windows Vista Master Boot Record (MBR) and boot code, which transfers control to Windows Boot Manager (WBM) program.

Use Bcdedit.exe for creating a manual entry in BCD Boot.ini file in earlier version of Windows.

Reboot your system.

If the above method does not work, you need to format your hard drive and reinstall Windows Vista. In this case, you will lose all your hard drive partitions and need to Recover Partitions.

The make it quite easy to retrieve lost hard drive partitions. The software are able to handle all types of partition loss situations, using advanced scanning methods.

Stellar Phoenix Windows Data Recovery is the best made software that provides assured recovery of lost Windows partitions. It recovers FAT16, FAT32, VFAT, NTFS, and NTFS5 file system partitions. The software is designed for Microsoft Windows 7, Vista, 2003, XP, and 2000.

“Boot Disk failure” Or

“Operating System Not Found”

This behavior of Windows takes place when the hard drive is detected by BIOS (Basic Input Output System) but operating system doesn’t load. The system might get stuck on the second screen during the boot process and operating system may refuse to load. These circumstances could be really troublesome as there are very few troubleshooting options available to resolve them. There could be several reasons behind Windows bootup problems. The most common ones are as follows:

Corrupted Boot Loader: If you are working on a dual boot system, there are strong chances of boot loader corruption. For instance, if you are using Windows XP and Linux using LILO (LInux LOader) as boot loader and LILO gets damaged, you could not boot your system using either operating system. MBR Corruption: This problem could also occur due to corrupted MBR (Master Boot Record). It is the main program that is used for bootstrapping operating system, after BIOS executes the machine code instructions. Boot Sector Virus: The most probable reason of this behavior of Windows could be a boot sector virus. You can confirm it by connecting your hard drive to another computer and then scanning it using good antivirus software.

In either of these situations, the only option you have to fix the problem is to install a fresh copy of damaged system tool either it is boot loader or MBR. You can achieve this by recreating the partition structure, formatting the Windows partition and reinstalling the Windows operating system. It will fix all the disk related logical errors. But it also has a downside, recreating the partition structure erases the existing partition schema and thus all the underlying data goes missing. It puts you in immediate need of Partition Recovery. Partition Recovery is the way out of scanning your affected hard drive and then retrieving your lost partitions and data from them.

Partition Recovery is best possible through powerful Partition Recovery Software such as Stellar Phoenix Windows Data Recovery. Stellar Phoenix Windows Data Recovery is advanced Partition Recovery Software to achieve efficient Windows Partition Recovery. It is capable of retrieving data in all logical data loss situations. The e-mail recovery, disk cloning, read- only conduct, influential scanning mechanisms and live update are some major features which make this software world class. This outstanding tool is compatible with Windows Vista, XP, 2003 and 2000.

When you come across any error message during the Microsoft Windows Vista upgrade installation, rollback phase might be either successful or unsuccessful.

Successful rollback

If rollback phase completes successfully, you could start your Microsoft Windows XP on the system. Rollback procedures restores personal data files to original location on hard drive. After successful rollback, go through underwritten steps:

Ensure that personal data files are on correct location. If these files are missing, find them in following folders:

\$WINDOWS.~Q\DATA\Documents and Settings\Username

$INPLACE.~TR\Machine\Data\DATA\Documents and Settings\Username

\Users\Username

Check setup log files to consider reason of installation failure.

Unsuccessful rollback phase

If the rollback phase does not complete successfully, you might encounter any of the following things:

Your system does not boot up and you come across an error message while trying to run your system.

You get the “Rollback Setup” error message each time when you attempt to boot your system.

If you attempt to start your previous operating system installation, you come across error message, which resembles the below error message:

Windows could not start because the following file is missing or corrupt: File name

The hard drive boot sector still use the Bootmgr (Windows Boot Manager) in place of the NTLDR (Windows NT Loader).

Rollback data for installation is either damage or inaccessible.

In case of unsuccessful rollback operation, you need to format the hard drive and reinstall the operating system. This process has a downside that it removes all disk partitions and cause partition loss. In such situations, Windows Partition Recovery is required.

Recovery is potential through Partition Recovery Software. These tools are quite easy to use and work in most of the cases of Windows partition loss. The Partition Recovery programs maintains the integrity of your valuable data as they have read-only and non-destructive conduct.

Stellar Phoenix Windows Data Recovery is the most effective solution for all your partition loss situations. The software recovers all FAT32, VFAT, NTFS and NTFS5 file system partitions. It is usable with Microsoft Windows 7, Vista, 2003, XP and 2000.

As a practical instance of this hard drive failure and file loss problem, you may come across the below error message while trying to boot your Microsoft Windows XP operating system-based computer:
“Hard disk drive failure”

At this point, if you attempt to boot your system using boot disk of Microsoft Windows 98 operating system, and then try to access disk partition information with the help of Fdisk.exe (MS-DOS utility), another error message may be displayed:

“No fixed disk present”

After the occurrence of above error message, you can not get into your system and access stored files from Windows hard drive. To retrieve lost files in such cases, you are required to identify the actual cause of this behavior and then perform Windows File Recovery by sorting it out.

Grounds of the issue

The above problem may take place with a Windows XP-based computer if any of the following conditions are true:
Your Microsoft Windows XP hard drive is not properly installed.
The hard drive is not configured correctly in BIOS (Basic Input/Output System).
Hard disk drive is either corrupted or damaged.
File system is damaged and hard drive is RAW.

Solution

To sort out this behavior of Windows computer and perform File Data Recovery, take assistance from your computer vendor if hard drive is having physical issues. On the other hand, if logical problems to the hard drive are causing this issue,  you should format the hard drive and reinstall operating system.

However, formatting removes all files from hard drive and eventually call for File Recovery Software to get your files recovered. The applications use advanced scanning techniques to methodically scan entire Windows hard drive and extract all lost, missing, and inaccessible files from it.

Stellar Phoenix Windows Data Recovery software recovers lost Windows files in all cases of file loss. The software works well with Microsoft Windows 7, Vista, 2003, XP, and 2000 operating systems. It supports safe and easy recovery from NTFS5, NTFS, FAT32, VFAT, FAT16, and FAT12 file system partitions.

When you start Microsoft Windows XP SP2 (Service Pack 2)-based computer, you may come across the below error message:
“Windows could not start because the following file is missing or corrupt.
Windows root\system32\hal.dll.
Please re-install a copy of the above file.”
This error message terminates the boot process and renders your Windows system inaccessible. To get your lost files back, perform File Recovery to fix this issue.

Grounds of the problem
You may come across this problem due to any of the following reasons:
The partition or boot record of your MS Windows XP computer is either damaged or corrupted.
The Windows hard drive or its file system is corrupted and damaging the Hal.dll file, the Ntoskrnl.exe file, and the primary Windows boot record.
The Ntoskrnl.exe and the Hal.dll files of your Windows XP operating system are corrupted.

Resolution
You can sort out this problem using any of the below methods:
Repair the damaged MBR using fixmbr command in Microsoft Windows XP Recovery Console.
Check the integrity and consistency of your Windows hard drive using Chkdsk utility. It also fixes some minor errors with the file system.

If the above methods do not work, format your Windows hard drive and reinstall the operating system. It solves all of the hard drive related problems.

However, formatting the hard drive removes all the files and causes significant file loss situations. At this point, you need to scan your Windows hard drive using File Recovery Software to retrieve lost files. The File Recovery tools are capable of effectively handling all types of data loss situations.

Stellar Phoenix Windows Data Recovery software recovers lost documents, PDFs, songs, videos, images, and other files. The software works well with Microsoft Windows 7, Vista, 2003, XP, and 2000. It recovers files from NTFS5, NTFS, FAT32, VFAT, FAT16, and FAT12 file system partitions.

As an practical example of this problem in Microsoft Windows operating system, you may come across the below error message when you try to create a swap file:

“The partitioning scheme used on your hard disk prevents the creation of a permanent swap file.”

The above error message prevents you from creating the swap files.
The problem occurs even if your using Virtual Memory dialog box when you install Microsoft Windows or 386 Enhanced alternatives in the Control Panel to create the swap files.

Root of the issue:

The above problem may take place due to any of the below reasons:

A Windows partition manager
Un-initialized files of the partition table
A virus or any other malicious program
Microsoft Windows operating system is quite cautious about the type of hard drive, when it creates permanent swap files. If you modify the Windows hard drive improperly, which is formatted through a special software, you may face serious data loss and disk error problems. To prevent data loss issues, Windows insures that correct format of the hard drive is recognized.

If you modify the Windows hard drive incorrectly, serious partition loss situations occur. Partition loss mostly occurs if:

Your system is dual-boot and both OS’s are using varying partition schemes.
Your system has deadly viruses.
In both cases, you lose your hard drive partitions and need to recover partition using powerful third-party applications.

The partition recovery software helps you to methodically scan entire hard drive and extract all lost partitions from it. The Windows partition recovery tools has interactive and rich graphical user interface to ensure quick and easy recovery in all partition loss situations.

Stellar Phoenix Windows Data Recovery software safely recovers lost, deleted, corrupted, or missing Windows hard drive partitions. The software is designed for Microsoft Windows 7, Vista, 2003, XP, and 2000. It salvages NTFS5, NTFS, FAT32, VFAT, FAT16, and FAT12 file system partitions.

You may come across this behavior after you carry out any of the below actions of your computer, which has Microsoft Windows XP operating system pre-installed by an OEM (Original Equipment Manufacturer):

You reinstall the operating system in same directory using Upgrade (Recommended) option after running Winnt32.exe, or using Install Windows XP option on “Welcome to Microsoft Windows XP” screen. It is also called in-place installation or in-place upgrade.

You reinstall Windows XP by formatting the primary partition, which contains your applications, data, operating system, and program settings.

You repair the installation of Windows XP by booting your system from Windows XP boot CD, pressing Enter key to set up Microsoft Windows XP, and pressing R key to repair selected installation.

Cause

This problem may occur due to either of the following reasons:

The Undo_guimode.txt file is there in “System32″ folder of Windows hard drive. This file is created by a wizard, which runs when you boot your system that has pre-installed Microsoft Windows XP operating system.

Formatting the primary partition of your hard drive removes all of its contents. It removes MFT (Master File Table) or FAT (File Allocation Table) entries, which are required by the operating system to locate and access files.

Resolution

Try out the following things to fix the issue:

Install latest service pack of Microsoft Windows XP.

Restore data from backup.

However, if you do not have a backup or its not updated, Windows Data Recovery is required.

You can recover lost, missing, and inaccessible Windows data successfully using Windows Data Recovery Software. They work in all cases of data loss and retrieve data using powerful scanning algorithms. The Windows Partition Recovery tools let you perform recovery on your own as they have simple graphical user interface. The integrity of your data is preserved by these software due to their read-only and non-destructive conduct.

Stellar Phoenix Windows Data Recovery recovers lost files, folders, and partitions from Windows hard drive. The software supports recovery from NTFS5, NTFS, VFAT, FAT32, and FAT16 file system partitions. It works well with Microsoft Windows 7, Vista, 2003, XP, and 2000 operating systems.

The cman_tool could be used for joining the nodes to cluster, kill another cluster node, change value of the expected votes of cluster, and leave the cluster. You should be careful while using this application and must understand the consequences of commands issued through cman_tool. They might affect all the nodes in cluster. In most of the cases, this program is invoked by the shutdown and startup scripts. The cman_tool uses various subcommands, which include the following:

Join- It is the major use of the cman_tool. This utility instructs cluster manager to try to join the existing cluster or form a new cluster (if there is not existing cluster). If you do not give any option to the command, it would take cluster configuration information from Cluster Configuration System (CCS).

Kill- Tells the CMAN to kill another node in cluster. It would cause local node to send “KILL” message to the node and it would shut down. If the node had failed, recovery would occur.

Leave- Tells the CMAN to leave cluster. You can’t do it if the subsystems (like GFS and DLM) are active. You need to shutdown CLVM and dismount all the GFS

file systems before using the cman_tool leave. Before applying the force command with this option, you should create backup of all your valuable data as it might cause critical data loss situations and need Data Recovery Linux to handle it.

Linux Recovery is potential through powerful third-party applications, known as Linux Data Recovery software. They use extensive scanning techniques to thoroughly scan whole hard drive and extract all of your valuable data in most of the data loss situations. They have simple graphical user interface and thus do not need sound technical skills to retrieve data.

Stellar Phoenix Linux Data Recovery is an effective tool to ensure absolute recovery in the majority of data loss situations. It supports recovery from Ext4,Ext3, Ext2, FAT32, FAT16 and FAT12 file system volumes. The software works well with all major distributions of Linux including SUSE, Red Hat, Mandriva and Ubuntu.