Download and peruse Greg Shultz's excellent Jan'06 TR post:
http://tinyurl.com/5tl82j
Microsoft has some [i]Knowledge Base[/i] bulletins that may be helpful:
http://support.microsoft.com/kb/314477/
http://support.microsoft.com/kb/945380/en-us
But when all is said and done, it may be simpler and quicker to [i]wipe[/i] the hard drive, reformat and then attempt to reinstall Windows XP.
1) Download the free utility [i]Darik's Boot and Nuke[/i] from:
http://dban.sourceforge.net/
2) Download free CD burner software to create a [i]bootable[/i] CD:
http://cdburnerxp.se/
3) Follow the instructions to create a bootable CD:
http://tinyurl.com/4f3coa
4) Download the free [i]Seagate[/i] HD utility:
http://tinyurl.com/yvq99t
5) Create a bootable CD with the Seagate HD utility, run the HD diagnostics, and if the HD is healthy, format NTFS.
6) Reinstall Windows XP
Rick/Portland, OR