How to Restore a Computer to Factory Settings Without a Disc
Although many computers feature a disc that owners can use to restore the computer to its factory settings, it is not absolutely necessary for a computer owner to have access to a restore disc. Computers that run on the Microsoft Windows operating system include a "System Recovery" function that allows users to restore the computer to factory settings without a disc.
Plug the computer into the power adapter if you are restoring a laptop.
Close all open programs.
Click "Start" and select "All Programs."
Click "System Recovery" and select "PC Recovery."
Select the "PC Recovery" option when the screen that lists recovery options appears. Click "Next."
Wait while your computer restarts. Click "OK" when the "Welcome to PC Recovery" message appears.
Select "System Recovery" in the "System Recovery Panel." The system will reformat itself and destroy all data.
Restart the computer when prompted.