A Virus Disabled My System Restore

Enable From Windows XP
1. Click 'Start,' right-click 'My Computer' and select 'Properties.' Select the 'System Restore' tab.
2. Clear or disable the check box 'Turn off System Restore' from the selected list of available hard disks.
3. Disable the check box stating 'Turn off System Restore on all drives' if you have multiple hard disks active on your computer. Click 'OK' for all changes to take place.
Enable From Windows Vista
4. Click 'Start' and launch 'Control Panel.' Click 'System and Maintenance' followed by 'System.'
5. Click 'System Protection' from the left menu to launch the System Properties applet.
6. Enable the check box next to each hard disk where you wish to activate System Restore. Click 'OK' for all changes to effectively take place.
Enable From Windows 7
7. Click 'Start' and launch 'Control Panel.' Click 'System and Security,' then 'System' from the list of available options.
8. Select 'Advanced System Settings' from the left pane, then browse to the 'System Protection' tab.
9. Select the hard disk for which you wish to enable System Restore and click 'Configure.' Select 'Restore system settings and previous versions of files.' Click 'OK' followed by 'OK' again to exit the System Properties applet.
Perform Virus Scan
10. Obtain and install a reliable anti-virus program such as AVG, Microsoft Security Essentials or Avira Antivir. Such tools are freely distributed and provide efficient protection against computer viruses.
11. Update your anti-virus through the main menu to keep its definition files current. The definition files act as the engine of the anti-virus, providing it with a profile of the latest computer threats available.
12. Perform a full system scan on all available disk drives and partitions. Even if you do not suspect a section of your computer drive(s) to be infected, allow the anti-virus tool to inspect it because viruses may spread through file access and copying by the user.