Why were you attempting system restore? What was the problem?http://www.microsoft.com/technet/prodtechn...rwxp.mspx#EIIAC
Excerpt from above link:
Q. What should I do if System Restore does not work?A.
Try these steps if System Restore does not appear to work:
Ensure the System Restore service is running. For more information, see: How can I verify that the System Restore services are running on my machine?
Verify that you have enough free space on all your drives as required by System Restore. If the free space on any partition system restore is monitoring falls below 50 MB, System Restore will suspend and purge out all restore points to free up disk space. It will automatically reactivate when 200 MB+ free space is available. For more information, see How the System Restore Tool Handles Hard-Disk Space Usage.
Examine event logs for any system restore-related errors that could help you identify the problem.