You said you'd tried 2 different DVDs. I'm hoping you meant CDs and not DVDs because I know of no copy of XP that came on a DVD. I can tell you, however, that I have seen installation errors caused by bad RAM. If you are using DVDs, however, your problem is there. If you're using known valid CDs, I'd get the HD manufacturer's diagnostics disk as well as download memtest86 and check the hard drive and RAM for problems.
for the repair option of an existing xp pro install, at about 65%, I start getting messages that various files are not copied correctly, 'the file setup placed on your hard drive is not a valid windows xp system image..... if you are installing from a cd there may be a problem with the cd...'
I've tried 2 different dvd's with the same result, however, different files.
is this indicative of a bad drive? bad sectors on the drive?