A driver restore disk works with a Windows XP disk to return your Acer Veriton M261 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 Veriton M261 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.