Hi,
can you give some informations about your webcam (model, modified or not, filter), your headtrack model (LEDs, dimensions), windows.
Reinstall Freetrack with admin rights under Win7 and 8 under "Program Files x86" (same for Vista).
Choose the model in the "Model"- section and fill up your dimensions and position.
http://forum.free-track.net/index.php?showtopic=4039&message=19522
In the "Cam" -section you need to check your webcam under "source". Then go for start and check if your LEDs are properly tracked as shown on the screen-shot , (three dots with three white crosses).