Well if you were in WinXP I'd say turn off the fancy menu systems. It could very well be your NVidia driver update. Did you completely uninstall any NVidia drivers before updating? Also make sure NVidia didn't install some color management or other software that could be messing with your system. Also try defragging your hard drive. Could be a bad sector. P5 latest patch is very stable for me. I run XP and 2K on two machines both of which have TI4200 cards.