FreeTrack wont work without TrackIRFixer. Atleast for me.
EDIT:
On second though I never tryed playing without TrackIRFixer on latest Free Track version. Will try now
I have simmilar problem. I got "Corrupted Memory #37"
It only hapent when I try to use Free TRack and TrackIRFixer.
Battleeye 1.148
OA 1.60.87816
Vista 64x
And I dont have any dsound.dll file in my ARMA2 folder or Expansion folder.