Vista SP1 was recently handed out to some select testers, with mixed results. However, things took a turn for the worse when Microsoft tried to release one of the first updates to SP1. Update KB937287 will effectively freeze most computers caught trying to put it onboard. Most users who will get a problem don't see the issue until it is too late. There is a general consensus that users will see a certain "Configuring updates: stage 3 of 3 - 0% complete" error, and then get stuck in a reboot cycle. When Microsoft caught wind of this, they began an investigation. The report will determine how widespread the problem is, how to fix KB937287 and if this error can somehow be fixed. Until then, Microsoft has pulled the update before it can brick more computers. At this point, the best way to fix this is to stick in your Windows Vista install CD, and run System Restore from the CD. If you somehow manage to fix your PC, Microsoft urges that you turn off Windows Update until they sort out this whole mess.