Can you try starting Blender with a command line window (which will propably show an error message when you enable it)?
e.g. Use the windows start button to call the program "cmd" and enter then the full path of the blender binary
Maybe it's visible by default in Windows, not sure.
Can you post the reported error here?
Edit: I just tried what happen what the m3.py file does not exist and I experienced the same problem. The m3.py file didn't get properly generated at the first initialization but only at reload. I fixed it and committed the changes. Thanks for your bug report!