I have the same problem with my Logitech USB Headset H330!
Yesterday I had sound and everything was fine with my old non-USB headset. But then my headset fell down and was broken.
So I bought the H330 today.
Unchecking the "Allow applications to take exclusive control of this device" in Sound (for output and input) doesen't work for me!
ARMA OA starts up and shows the main menu, but even before I can click something it crashes to desktop. If I start it without headset I works fine.
Windows 7 Home Premium 32 Bit (German)