"no restore disc or xp disc"
i would be afraid to even turn it on lol.
get yourself a copy of drive image or acronis,ghost etc and make an image to another drive or cdr`s while its still working ok.
sooner rather than later you are going to need it.
i have used regseeker and jv16 powertools and both have never gave me any problems click here click here
if you really want to try one make a restore point before using just in case.