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I am using TrackIR 4 Pro in the following environment now.
The version of software is 4.1.030 beta 2.

Windows XP Home Edition version 5.1.2600 Service Pack 2
x86 Family 15 Model 2 Stepping 9 GenuineIntel ~2593 Mhz
physical memory 1,536.50 MB

When Flight Simulator X is installed and TrackIR 4 Pro is started, it operates normally.
However, TrackIR 4 Pro doesn't react when Combat Flight Simulator 3 that has operated normally up to now is started.
A blue lamp did not light though a green lamp lit.

TrackIR 4 under Combat Flight Simulator 3 operated normally until Flight Simulator X was installed. The reason not operated is not understood.
I want to play Combat Flight Simulator 3 by using TrackIR 4 Pro in the future.

Please teach the method of settlement for TrackIR 4 Pro to operate normally.

Have you tried a clean install of the TrackIR software, and of CFS3?

Thank you for the reply.
The cause has been understood.
It is Anti-Vruis Software(TrendMicro : Virus Buster 2007).
This software was ended, and TrackIR 4 Pro operated normally when CFS3 was started.
This Anti-Virus Software is harmless in FS X.
Only when CFS3 is started, TrackIR 4 Pro is done without can use.
Please warn the person who is using this software.
I like TrackIR 4 Pro very much.
I am expecting that a lot of game software corresponding to TrackIR 4 Pro will come out in the future.
Thank you.

Thanks for the tip.