I did a bit more work on the computer this evening. I got the sound card working again, and discovered that Windows did not over-write the newer video drivers, so I don't need to reinstall those. I forced through the RAID drivers again, ignoring Windows protests that it would turn into a pumpkin if I installed them, and this time they worked and I can see the HD on the RAID controller now. Huzzah. I had a hunch that it wasn't those drivers that killed Windows the first time, and I was right. On the other hand I'd set aside a block of time to repair XP again if needed. Perhaps I'll use that time to write haiku.