Had issue when trying to load ArmA3; wouldn't load ArmA3. From the Windows Event viewer received this message:

Faulting application name: arma3.exe, version: 0.5.102.571, time stamp: 0x512deb6a
Faulting module name: nvwgf2um.dll, version: 9.18.13.1407, time stamp: 0x5116d87b
Exception code: 0xc0000005
Fault offset: 0x000fd53a
Faulting process id: 0x1fe4
Faulting application start time: 0x01ce19b3d53e704d
Faulting application path: C:\Program Files (x86)\Steam\steamapps\common\Arma 3\arma3.exe
Faulting module path: C:\Windows\system32\nvwgf2um.dll
Report Id: 1b994e90-85a7-11e2-946a-f46d041bbad6

Was reproducable. Solution was to rollback the driver to: 306.97-desktop-win8-win7-winvista-64bit-english-whql

And now ArmA3 works fine. Probably related somewhat specifically to an issue with Nvidia Drivers and GTX 570. Heard of similar issues with Far Cry 3. More of a heads up for support guys.