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I installed TrackIR 2 days ago. It worked fine for one day.
Yesterday I tried to modify my profile and TrackIR hangs (I don't remember the message). Then I cancelled the profile but trackIR does't start. I had a message from windows ("There is un error on treckir 5.0. Application will be closed").
I removed TrackIR and reinstalled it.
Same problem.
I restore an old image of windows and reinstalled TrackIR.
same problem.
I installed on another partition of same PC. Same problem.
I installed on another desktop computer. Same problem.
I tried beta version. Same problem.
Finally I tried to install on Laptop. TrackIR worked fine.
I restored again another image on my desktop but when I start TrackIR I have same message error.
File log is ok (the same on laptop and desktop).
I don't have background applications running (I think) and my antivirus is stopped.

MBO Asus P5QE
CPU Intel Core 2 DUO E8500 3.16GHZ
Graphic card GeForce GTX9800 drivers 191.07
Win XP PRO 32 SP3
TrackIR 5 Pro with track clip Pro SW 5.0.final.B

Any suggestion?
Thanks

After an hard work I find the solution.
I don't know why but the problem is on default profile.
If I remove the contents of profile folder and I copy anothe user profile it works fine.
In effect the problem starts when I modify a profile but when I disinstall I removed also naturalpoint folder and same problems happened on another windows partition and another desktop PC.
Any idea.
Bye.