I'd try running the following as well on the hdd in question Sysclean
you'll also need the virus template file from here
Build the Ultimate boot CD 4 Windows
and get the Spybot Plugin here
for it and run that on the infected hdd. Spybot when run from the ubcd4win disc will load the registry on the infected PC.
Other than that it might be rescue the data and reinstall XP, but I'd so this with a slipstreamed XP CD with SP2 with it.
Fabs autobackup is also on the ubcd4win which will allow you to back up bookmarks etc... and restore them later, here's the windows version.