It was a fresh install, but I went to driverheaven.net and picked up the 3.7s, then went back to 'em. Working fine now. Odd thing is someone mentioned worms 3D stutters--I'm having no problems with it (at least, the second demo anyway). I just ordered the full copy, and since it's gotta get shipped across the pond it could be awhile.
Donating one click a day.