I have a Dell Demetion 8400 with Windows XP. I recenty purchased a refurbished Dell from Dell Auction for my daughter to replace her old Compaq with windows 98. The problem is the refurbished Dell came with no operating system. I thought I could just install Windows XP using the install cd that came with my Dell. It isn't working. Any ideas? Or should I just return this computer and buy one with Windows already installed.