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Recovery Methods : |
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Once a computer has been compromised by a virus, it is usually unsafe to continue using the same computer without completely reinstalling the operating system. However, there are a number of recovery options that exist after a computer has a virus. These actions depend on severity of the type of virus.
Virus removal: One possibility on Windows XP is a tool known as System Restore, which restores the registry and critical system files to a previous checkpoint. Often a virus will cause a system to hang, and a subsequent hard reboot will render a system restore point from the same day corrupt. Restore points from previous days should work provided the virus is not designed to corrupt the restore files. Some viruses, however, disable system restore and other important tools such as Task Manager and Command Prompt. An examples virus that does this is CiaDoor. Administrators have the option to disable such tools from limited users for various reasons. The virus modifies the registry to do the same, except, when the Administrator is controlling the computer, it blocks all users from accessing the tools. When an infected tool activates it gives the message "Task Manager has been disabled by your administrator.", even if the user trying to open the program is the administrator. Operating system reinstallation: As a last ditch effort, if a virus is on your system and anti-viral software can't clean it, then reinstalling the operating system may be required. To do this properly, the hard drive is completely erased (partition deleted and formatted) and the operating system is installed from media known not to be infected. Important files should first be backed up, if possible, and separately scanned for infection before erasing the original hard drive and reinstalling the operating system.
Ref.: wikipedia GNU Free Documentation License
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