Picked up a used Dell to use for retro gaming only to find out the previous owner replaced XP with Windows 7(recovery partition deleted in the process). Thought I'd just pull out my XP professional disk and use the XP sticker to activate, but nope turns out the key on the XP sticker is for Media Center Edition and not XP. I have a XP Media Center Recover disk, but it's a gateway/emachines disk.