After after a virus infection, it may be necessary to remove restore points, as some of them are infected.
Note that: As from Windows 7, you can remove the restore points without disabling the SystemRestore feature.
Click the Windows logo(Start Button), right click on "Computer" then click "Properties":
Then click on "System Protection".
Click on "Configure".
To disable System Restore, select "Disable System Protection" then click "Apply". If you want to simply delete the restore points, click "Delete" and confirm by clicking on "Yes".
Confirm the operation.
To Enable the system restore, just select "Restore my system settings and previous versions of files" instead of "Disable system protection" and then confirm with "Apply".