Hi BadPat,
I had a read of your updated forum post, still no joy with the black blocks appearing in game.
I did a google search of the problem "black blocks in game graphics" which yields a number other threads discussing this problem in a number of different games. I would suggest trying the same and reading around a bit. I think I had covered many of the suggestions from these sorts of threads - in general people suggested either driver software conflicts or hardware problems including overheating or dying / defective graphics card(s) (where the game in question was perhaps pushing the graphics card to it's limit). As I said in my previous reply, I have the same graphics card as you with a similar spec pc, so in theory it should be capable of running CoD without such problems.
Something that would be useful to know and would help in diagnostics would be the nature and appearance of black blocks - namely, do they appear whenever you load the game or do they appear during the game, that is, over time?
I hope other forum users can pitch in as I have limited knowledge and have never personally come across this problem before, maybe others may have a better idea as what is causing the problem.
Best of luck, I know the pain and hope you can get it fixed!
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