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The problem is solved. In my case it's been usb headphones with mic. Seems, together TrackIR and phones requires too much power. It needs to plug each of this devices into independent USB line. I plug phones into another port (on external 2 USB port module) and everything works again.

Sorry for my english. Initially always works fine. Suddenly i began getting Unhandled Error from TrackIR software. I've tried to reinstall software with no result.

WinXP SP2. Hotas Cougar. Saitek Pro Flight Rudder Pedals.
TrackIR software version 4.1.036

Thanks