I am having a problem in Windows 7 Ultimate in which Windows keeps reverting to generic, low-res graphics. Windows seems to function just fine at 1680 x 1050 using my ATI Radeon HD 4600 Series graphics card UNTIL I do something that invokes UAC, like attempt to install some new software. As soon as the UAC prompt comes up, the screen reverts to the generic, low-res graphics. At that point, I have to go into the device manager and select "Scan for hardware changes" in order to make Windows revert back to using my graphics card. After doing this 500 times, its getting really old!!! Has anyone else run into this problem??? Thanks!