Absolutely insane. I heard about it a few weeks ago and ran windows update, grabbing what I thought were the necessary patches, but evidently the RPC fix wasn't included. I got the reboot a few times last night, and about once every minute today. In the end it was a race against the shutdown clock for the patch to download from ms.com... it finished about 3 seconds before the clock hit 0 and the comp rebooted. Stupid dialup

The patch did the trick, though, and I deleted the files (well, PC-Cillin nabbed em) and removed the registry settings.
I think it's the first time I've ever been hit by something like this. I'm absolutely amazed at the speed it's spread.