Simple...quit trying to use an operating system installed on the old harddrive hooked to the new machine...reinstall winders...XP tends to like being installed on a fresh system instead of just being booted up and finding out the hardware that the operating system was first installed using has changed all of a sudden. Winders 2000 didn't mind so much...but XP seems to balk a lot at that proposition. Just do a fresh install of XP and you should find that everything will work(perhaps after drivers are installed) as expected. Of course I must stress you back up any files that may be on the old hdd, do a full format with a new partition table and maybe even a new boot sector and then just put XP back on...if I have spoken mistakenly or errored in any way with my opinion, I apologize in advance and wish to correct it as soon as possible...