

For example, if the computer is infected with a virus, then it is possible that the virus could be backed up by System Restore.

While this is a desirable feature, in some cases it should be temporarily turned off. This gives you the choice of restoring your computer to any number of previously saved states. Unlike the "Last Known Good Configuration" feature, System Restore maintains multiple restore points. You can use System Restore to restore the computer to a previous state, using the backups that it makes of selected system files and program files. System Restore, a Windows XP feature, is similar to the "Last Known Good Configuration" in Windows NT and Windows 2000.
