parallel restore vs. windows

OK, after quite some trying I have hit a brick wall. I have been unable 
to get parallel restore to work with Windows threading. No doubt I am 
missing something, but I really don't know what. Unless someone can tell 
me what I am doing wrong, I have these possibilities:

    * run parallel steps on Windows in separate processes rather than
      threads, similar to what we do in the server, or
    * disable parallel restore on Windows for now.


Time is unfortunately running very short.

Latest attempt is attached.

cheers

andrew