You know, PXE booting is one thing I've never played with. I should screw around with that one day for shits and giggles just to gain some experience with it.
Even if data exists on the drive that can be recovered, I'd be EXREMELY hesitant to hooking it up lest you reinfect the system. Tho the virus scanner was able to detect the major one, there COULD be some that are undetectable/exotic. But if the data is that important, try getting the system to boot from CD and resintall to a new drive, then attach the old drive via a USB enclosure (geezus, does that thing even HAVE USB?

) and copy the data over selectively.
If it DOES have USB, is the BIOS new enough to boot from a USB key? Might try a tiny linux install.