Yes, I run FAF without any problems on exact that PC 2 Weeks ago (with another USB-Headset, Keyboard and Mouse). I dont think that is the Problem, but ill it it tomorrow to be sure.
Dont got any more Ideas...
The only thing i changed (out of Monitor, Headset, Mouse and Keyboard) is, that I installed DATEV on that PC (its a Businessprogramm, that was not that easy to install and update to my base data - so I dont wanna kill Windows and do a clean installation.)
I also tested with an USB-Soundstick (i found here from an older Logitechheadset,Plug&Play) - and I disabled everything else - doesnt works
I got sound, but the game freeze when I closed it...