There is a patch that you absolutely MUST download in order to get the game running more or less bugfree, i suggest you get it and install it before starting a new game. There even is a gamekilling bug at the end of the vampirehunter's base, which will make the game CTD time and time again UNLESS you get the patch. My game is pretty much bugfree now, and i think the game is great.
Btw...you got ripped off, i got my copy for 10€
