@OP
I'm on a similar build and experience no problems at all (aside from having to restart the campaign early on while I was playing on my laptop). I haven't gotten a CTD or any kind or error/bug since then.
Intel Q6600 @ 3.0GHz
XFX GTX 260 Core 216
4GB Kingston HyperX T1
Windows 7 RC1 x86
ForceWare 190.56
ArmA 2 1.03
ArmA 2 plays great at all very high with a view distance of 3600. You can acquire the 190.56 driver here.