1Click Start 
→Control Panel→System and Maintenance→Back Up and Restore Center..
2In the Tasks list, click Repair Windows using System Restore.
3Click Continue in the User Account Control (UAC) dialog box asking for permission to run the application.
4Click Next in the System Restore window to view the most recent restore points in chronological order.
5Select the Show restore points older than 5 days checkbox to view the complete list of restore points.
6Select a restore point. Try to restore from the most recent restore point. If this fails to correct the problem, try the next oldest restore point until the issue is resolved. Any software installed after the selected restore point will need to be reinstalled.
7Click Next→Finish.
8When prompted, click Yes.
9After System Restore finishes collecting data, the computer restarts.
10After the computer restarts, click OK.
To change the restore point, you can either repeat the steps using a different restore point, or you can undo the restoration.
If you encounter any error messages during the restore process, follow the prompts on the screen to correct the error.
Undoing the Last System Restore
NOTICE: Before you undo the last system restore, save and close all open files and exit any open programs. Do not alter, open, or delete any files or programs until the system restoration is complete.
1Click Start 
→Help and Support.
2Type System Restore in the search field and press <Enter>.
3Click Undo my last restoration, and then click Next.
Troubleshooting
