Some users have reported an issue in which the display/monitor constantly flickers after updating to Windows 7. One poster to the Microsoft TechNet discussion boards, gbaker123, writes:
“The issue I am having is the screen is flickering and I can’t read any dialogue boxes. For instance, not even the screen resolution mode will come up. […] It’s so annoying I am likely going to give up on RC1 unless I can get this fixed – it won’t keep my settings too, keeps forcing back to 59.
The fix for this issue is generally to apply an updated video driver. In particular, if you are using an ATI graphics card, try applying the latest driver (currently version 9.8) from this page.