I purchased/downloaded the game from Steam. When I start up the game, the main menu appears fine however the 'water animation' around the centre choices 'new game, options, exit', etc is choppy and the sound stutters a lot, also producing a quite irritating metallic sound. This happens even with the dialogue in the tutorial section (did not start a campaign yet due to this very issue). Otherwise gameplay is fine and runs smoothly. So far I think it's a problem with Bink videos, since I experienced this with Torchlight II cinematics as well ( .bik files), but so far I haven't found a satisfactory solution.

I have updated my graphics card driver, HD audio driver, installed RAD video tools and media codecs, disabled antivirus, lowered video quality, and tried changing speaker configuration, to no avail. Though my Nvidia driver does not let me disable the hardware acceleration for sound (most people seemed to have been able to fix this problem by disabling sound hardware acceleration).

Any help would be greatly appreciated - this is the first problem I have ever encountered which I could not fix myself after a Google search