Weird shapes while flying

Hi, I'm running FSX with SP1 and 2 on a laptop with ATI Mobility Radeon X1400 and 1,96 gb virtual memory. I have to admit that installing SP1&2 improved performance a lot. However, now I have an annoying issue at hand: after flying for a couple of minutes (less than 2), it seems as if the screens are clogged up. I get big strange shapes all over the screen which makes flying impossible (I can upload a screenshot if somebody can explain me how to.... thanks). They come and go. I've tried changing the FPS and many other settings, but nothing seems to work.
Anyone out there with some advice.

Anyone out there with some advice.
