Windows utilizes a restore utility that backs up selected files automatically to the C:\_Restore folder. This means that an infected file could be stored there as a backup file, and VirusScan will be unable to delete these files. You must disable the System Restore Utility to remove the infected files from the C:\_Restore folder.

Note: To re-enable the System Restore Utility, follow the steps above, but remove the check mark next to Disable System Restore.
Windows XP
Disabling the System Restore Utility (Windows XP Users)

Note: To re-enable the System Restore Utility, follow the steps above, but remove the check mark next to Turn off System Restore on All Drives.
Note: Disabling System Protection will delete all existing restore points. To re-enable the System Restore Utility, follow the steps above, but check the box next to the disk on which you wish to enable System Restore.