I've seen it hinted at that the nvlddmkm crashes are a Vista-only problem (some thread or another here). Is this valid? Vista has its perks, but I'd reinstall XP64 if it would get this thing to go away permanent-like.

The other thing I've seen to try is disabling secondary monitors...comp's currently in pieces for maintainence, but back to trying that in time. Also doing the usual fun with Memtest & Prime95 to make sure there are no issues there (bad memory address will crash anything...OTOH with only nvlddmkm crashing and only in WoW that's a little specific for a memory issue...OTOH not much else is using a substantial portion of 8GB right now...).