1) Click the Start button
2) Follow the menus for the following:
All Programs > Accessories > System Tools > System Restore
3) Click "Next" when the System Restore window appears
4) Select a suitable date (generally before the problem occurred) when the "Select A Restore Point" screen appears
5) Click "Next" after choosing the restore date
6) After Windows completes the System Restore click "Finish" and let the computer restart