A problem has dected and windows has been shut down to prevent damage to your computer.If this is the frist time you’ve seen this stop error screen restart your computer.if this screen appears.again follow this steps: Check to be sure you have adequate disk space.if a driver is identified in the stop message,disable the driver or check with the manufacturer for driver updates.try changing video adapters.Check with your hardware vendor for any bios up dates disable bios memory options such as carching or shadowing if you need to use safe made to remove or disable conponents .restart your computer ,press f8 to select advanced .startup options.and then select safe mode.