OK so I followed their generic advice, and it seems to have worked. I have W7 64 bit, and changed Crysis2.exe to run in compatibility mode for XP SP3. Ive only played a few matches, but each has been on lighthouse, and a few after that and it seems to have worked.
Im aware that others with XP are getting this too. My brother has XP 32 bit and gets the problem, my friend has vista 32 bit and gets the problem.
Crytek please address this in the next patch

Did anyone else try this? Did it work? Also, did anyone else try the beta nvidia drivers?