No problems with 2K, i've been testing with it for a week now and it's all fine here. There are known problems with ATI videocards and probably some other little bugs so i suggest you try DX mode if you're currently in GL. Else reinstall i think.

As a side note in the insane madness that was the rush to get the Half-Life and Counterstrike patches I got the NMDA worm. I never opened an attachment in Outlook, so I am assuming that the worm came from some illegit sites out there offering infected versions of the HL patch or it came from some files (videos) I downloaded from bearshare. The reason I think it was probably the Half-Life patch is that a couple times, after downloading the full patch from some italian server (www.gib.it) and I executed the file, the installization wizard informed me that the patch wouldnt be installed because the file I downloaded was a few megs larger than expected. Lesson: be wary of dling from untrusted sources.