I stopped playing because the game would freeze up hard and I would have to reboot. This is still happening with beta C.
I run xp sp 3 32 bit with all the latest updates. I have a 8800 GTS (512MB version). I do not think this is a graphic issue. I play quite a few pc games and this is the only one that locks hard (ctl-alt-del does not work) and requires a reboot.
Drop an email if you need more information; i'll probably stop playing until the next update as having to reboot is quite annoying.
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Also graphics are great until I enter combat then I can't even see the enemies because everything is fuzzy.