Jose,

I am not sure if this is the problem or not.  Maybe it has to do with starting a program that requires user input?

I tried to execute calc.exe and it did not work.  However, I was able to exec .bat files as long I was not using the .bat file to open calc.exe

If you look at the task manager, it does start the program, but you are denied access to it so maybe it's a permission problem.

Hopefully someone will post a more definitive answer.