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#41
Did you find the XP disk? What does it say on it?
It appears the Gateway is a 500x Media Center, but shipped with either XP Home Premium or Professional. Nothing is mentioned in specs about XP Media Center Edition. Do you know which version XP you have?
Try booting the disk and navigate through the menus as shown in this tutorial to see if it offers the second Repair option which is a Repair Install: XP Repair Install - Part 1 of 2