For some reason I experienced no bugs for 12 hours straight, no crashes, messy animations... And so on. But when run on another computer running Windows 7 we experienced the exorcist bug, terrible animations, extreme bugs, npcs getting stuck in ground...
Currently i'm quite confused why it worked fine in XP and bugged out extremely in Windows 7, I can also see why the would release the game without knowing many of these bugs existed. (Getting alot of trolling, when it could be their pc at fault).
The hardware is quite different, Dual core + 2900Pro VS Quad core Q6600 + 4870 1gb. But it seems more like the operating system is to blame. Oh and I believe the update 2 patch increased and made the current bugs even worse, on the buggy pc.

Has anyone experienced bug free gameplay using the first release? No exorcist bug? Get bugs in XP?
Who knows, it may be helpful.