I have tried to install XP Pro on a new desktop computer. The computer already had Vista running on another partition without real issues. However it crashed and came up with a blue screen. The CD was all right because I installed on older computer without any problem. I suspected that the issues were driver problem. I had tried the same on a new laptop that came with Vista installed. I was trying to replace the Vista with XP. The XP install CD just couldn’t see the hard disk. I guess if I have XP CD that came with some service pack 2 or 3 might do all the trick.