Sorry to keep you hanging on this. Computer never responded to anything, could never finish Kaspersky scan. I even installed a parallel OS on another drive, then ran A/Vs on the XP drive while it was not the boot drive and it still drew to a BSoD.

I'm leaning toward the conclusion there's a bad sector or sectors on the drive itself. Rather than mess with it any further I've replaced the drive and installed an image from January. Didn't take too long to update. One of these days I'll test that drive out thoroughly and see what the problem was. Thatnks for your time, bud!