[Bounder!]

Wow, not seen anything like this before. I run exactly the same graphics card as you and have an amd 3.0 dual core processor and 4gbs ram. It's not the best setup for CoD but I run the game fine on low-mid range settings and have no graphic / display distortions at all. I've not had to disable anything on my pc including anything associated with steam.

Might be worth posting full systems specs including your operating system, cataylst control version etc. I assume you don't have problems on any other game? Not sure what to suggest as it seems an odd one tbh... does the problem manifest instantly or does it appear during a flight? Also, might be a long shot but it may be worth posting what settings you are using in CoD - is the epilepsy filter on / off, how about anti-aliasing and vsync?

Things that spring to mind are when you updated graphic card drivers did you delete your old ones first as I've heard this can sometimes cause problems...? What's the history of your pc - have you had it for a long time, have you replaced your graphics card and have you deleted old drivers? You could try running a program that checks for old drivers and conflicts? If it's not a software conflict could your graphics card be running hot?? Have you tried monitoring your graphics card temperatures whilst playing CoD? Also, have you checked the inside of your PC for dust build up, checked your graphics card fan is clear of dust?

Hope you get it sorted, hopefully people with better computing knowledge will have a better stab at helping you.