Originally Posted by grey_1
now here's the kicker - physx installed broken for me.
I had to uninstall phsyx via control panel, then reinstall the physx package downloaded from nvidia.
I don't have Arma 2, but this fixed all the crashes and lockups I was having in several other games for me.
Hope it works for you brother...
EDIT: this was with the 257.15s btw
I've had this happen before (not with the 480s but with 280s). Uninstalling PhysX and Nvidia's video drivers and then using driver sweeper and finally reinstalling everything fixed it for me (obviously with the requisite reboots in between).
And just to be clear, are you using 275.15? There were unofficial versions 257.07 and 257.76 but they were no good for gaming from what I've read.