Blah blah i'm obviously doing exactly that, and i've searched around for solutions, tried every damn thing, and it still doesn't work. I'm using the steam version and it's fully updated. Tried running as administrator, fucking around with the shader_client files, all that jazz.
It might still be the shader_client files for all I know, the things I read were full of conflicting information and a thousand dead links to 'fixes'. Please help, I didn't go through the trouble of downloading a 3 gig mod to stare at an error screen that shouldn't be there.