DELL Laptop M140.
Media Direct has problem. Only in watch Picture there is message: "Dummy Mixer Callback Windows: PCM2.exe Application Error."
The instruction at "0x01403f65" referenced memory at "0x000000". The memory could not be "read". Click OK to terminate the program.

I did reformat and reinstall Win MCE and Media Direct software 6 times, but it works perfectly in few time and after that the message appeared. (only watch picture has problem, other functions as Listen Music, watch Video, watch DVD alway perpect).
What is this problem and how to fix it???

Thanks