Well, it seems I got it fixed (I think

)
The BSOD turned out to be a bogus screensaver with a script to restart the computer after a certain amount of time.

Pretty inventive, I think. You could just hit "esc" to cancel the script and return to Windows. (Found that out by accident)
Anyway, here's how I fixed it:
First I ran Dr Web CureIt in safe mode which found a couple of hundred items
Then I ran it in normal mode and it found a dozen or so more
Then I ran SuperAntiSpyware in Safe then normal modes and found yet another 300 registry items including the .vbs script pointers
Then I ran Spybot Search and Destroy and it found the BSOD files, a couple of more scripts and the Windows AntiVirus 2008 files
It's been idling for about 30 minutes with no problems so maybe I got everything. Still slow as constipated crap with 256 MB of RAM

Customer is older guy on oxygen so upgrades aren't his big priority. Now keeping his grandkids off the computer is more important
Thanks!
Jack