Can a copy of Windows xp be bad?
I have seen where older CD/DVD drives have trouble installing the drivers.cab file when doing a WinXP install....
it trys to load/find the particular driver and hitting the try again key makes it look like it took, but in actuality it got skipped
( not saying you hit the skip key, one should never skip a troublesome file when doing an OS install )
also, when you say copy. is it a distributed copy ( Retail / OEM ) or is it a backed up copy of a WinXP install disc?
sometimes it is best to back up everything you want/can and then do a re-format and fresh install.....
outside of what GetBack posted, with possible Memory problem or component failing to do it's job in the PC
hope this helps.....good luck