A restore disk works with a Windows Windows XP disk to return your Acer Aspire One D250-1Bw Windows XP back to the original factory setup. Once windows has installed you put this disk into the drive as soon as windows gives you a found new hardware dialog box. Once inserted the Acer Aspire One D250-1Bw Windows XP will automatically find all the drivers and also install most of the original factory software. All Drivers and factory software are operating system specific.