I've noticed that on some Harddrives when you stick in the Windows XP CD, and get to the existing partion screen there is no repair feature, any reason why ?
The repair feature is kinda hidden. You have to start an installation. from there it will give you the EULA. Hit F8 to accept. Then it will say it found a installation of XP already on the machine. There it should give the option to repair the OS.