Hello, I just bought a refurbished Dell OptiPlex GX520 on ebay. It came pre-installed with XP home and the COA sticker is for XP Home. The seller included a Win 7 Pro and XP Pro reinstallation discs but no XP Home reinstallation disc. I'm sending this PC to my kids in the Philippines but I'm worried that in the event the PC crashes and they need to reinstall the OS, will they be able to install the XP Pro... even Win 7 without any activation problems? Thanks in advance!