In that case...just remove the hard drive and attach it as secondary drive to a known good system...move the graphics temporarily to either a partition/drive/removeable media...and attempt the clean install.
Not sure what your method of doing the clean install is...but I would verify that there are no necessary recovery/restore partitions on the subject drive...which deleting would thereby produce unwanted results. I would also ensure that I have convenient access to networking drivers and the appropriate license key (in anticipation of Product Activation).
FWIW: Differences between a Quick format and a regular format during a clean installation of Windows XP - http://support.microsoft.com/kb/302686
AND XP Clean Install, Stevens - http://www.michaelstevenstech.com/cleanxpinstall.html
Before attempting install, I might also do a run of the appropriate hard drive diagnostic, just to make sure that all will not be in vain due to hard drive problems.