Some common problems that could cause System Restore not to work properly and their solutions include the following:
There is less than 200 MB of free space available on the computer—free up some space on the hard drive by deleting unused files or images.
After rebooting, the restoration is unsuccessful—choose an earlier restore point and try again.
Restoration was denied due to non-administrator status—log out and then back in as an administrator.
The System Restore Service is not running—Open Administrative Tools, click Computer Management, and then click Services and Applications. Click Services, and double-click System Restore Services from the list. Verify the service is started and running. If not, under Service status, click Start and change the startup type to Automatic.