Soldato
I realise this may have already been said, but have you tried disabling multicore rendering as well as AA and all that stuff? Worked a treat for issues in the demo. Also try running it in a borderless window.
done everything, Ran it as admin workaround in compat mode, redownloaded the whole thing. Done the integrity check about 10 times redownloading the 2 corrupt files each time.
Tried running it in a window still instant crash to desktop no errors. Updated nvidia drivers to latest beta.
Ran -lv is only one that works for any amount of time but the game is horrible like that. Back to l4d and hope valve sort it properly.
Might format later just for laughs.