I have seen several posts in a number of places, both here and on other boards, about a mysterious 20 sec "freeze" when running under Vista that started occurring in early Sept, 2007, right after a Vista auto-update. I thought perhaps it would be most efficient just to post a new message here. I had the same problem. When researching the glitch, I notice a number of those affected had Nvidia display boards, including me. I went to the Nvidia site and downloaded and installed a new driver. The problem disappeared immediately. So it looks like that update in Sept introduced an incompatibility vis a vis the Nvidia board.