I have a GF4 Ti 4200 and decided to try out the new 56.55 drivers from Nvidia. Got them over at guru3d.com. All I have to say is that they solved all my nightmares with FS9.
Performance and FPS seems to have improved somewhat, but the best change was with the kneeboard. Now I can scroll down the kneeboard with AA enabled. Before, I couldn't scroll while flying in Fullscreen and with AA enabled in the Nvidia control panel. I can now.
So if anyone is having the same problem, don't hesitate and try these drivers out.