My setup is Windows 7 (64-bit) running on a 2009 MacBook Pro (Nvidia GPU). Using latest Nvidia drivers for Geforce 9400M. Boot Camp version is 3.2 This annoying problem has been ongoing for me for years. After I download and install the weekly Windows Updates the following happens: The computer reboots after update like it's supposed to and seems fine. However once the display goes to sleep the computer apparently freezes up and the display/computer will never resume again. The only thing I can do is hold down the power button and shutdown. (Very dangerous scenario if something I'm working on doesn't autosave.) This only ever happens if I perform a windows update and it only happens one time immediately after the update. Otherwise the computer functions normally and has no problems with the display or system sleeping.