Same thing happen to me, Then I found this.
http://forum.free-track.net/index.php?showtopic=1627#10513
But when I place it in the system32 folder, the same message came up. Then I put it in the system folder ( that was empty, and right above the system32 folder ) and it works.
Now its time to alter the webcam, My first time trying this.
PS, I'm using it for the LockOn flight sim