kvrajan, get this beta version:
And start Yawcam using the alternate start file: debug_start.bat
If you installed Yawcam into C:\Program Files\Yawcam the file will be located there.
Running Yawcam with this start file will create a file yawcam_debug_log.txt
with some extra debug info on your desktop.
Please email this log file to me. Hopefully this file will help me understand the problem better.
Note that the debug_start.bat will probably ask for permission to access windows registry. This is to be able to locate the path to you desktop.