System Restore debuted back in Windows Millennium Edition (Me, which we're all still trying to forget) and it has proven itself to be a life saver over the years. This feature carries forward in slightly improved form in Windows 7. System Restore automatically backs up key system files at opportune times, such as when you're installing a new hardware driver. (Otherwise, an automatic restore occurs once every 24 hours.) That way, if a driver or application wreaks havoc with your PC, you can use System Restore to reload older system file versions and get back up and running again. Microsoft describes this behavior as "restoring Windows to any earlier point in time," but we're pretty sure no actual time travel is involved.
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