Hey there, I'm having the exact same trouble as the esteemed gentleman above me. Ironically, I have the original game which I bought when it came out last year, that worked fine, not a problem. However, really really wanted the enhanced version and tried to download and had to register with a cd key, fair enough, one problem, my brand new copy of The Witcher came without a hard copy of the manual, just a pdf format one, so no key.....bugger. Anyhoo, thought I'd jump that problem by going out and buying the retail UK of the shiny new enhanced version which I did today. Great packaging and extras and wot not, very impressed. Just annoyed at the one tiny little problem of the game not running. The launcher comes up fine, click on start game and screen goes black, flickers a couple of times then the dreaded window pops up saying that windows has encountered a serious error and the app must close....send error report yadda yadda yadda......well...all I can say is AAAAAAAAAAAARRRRRRRRGGGGGHHHHHH.Please, all you tech and software whizzes out there, is there or can you find a solution for this teeny weeny little problem as I think I've lined Atari's and CDProjekts pockets enough with this one title, plus I really wanna play the damn thing, lol.