New windows installs

* New windows installs
* Handle installing msis
* Handle numpy install
Both good questions.  Uninstall I should look into, it would be nice to have for testing.  I suspect that, although this would successfully install the msi into your ve, it would not allow multiple installs. but I'll test that assumption.  This is not an issue for us with our future use cases (I think?) but perhaps we should spit out a warning?  I don't think it's worth the time to figure out how to fix this (how would one?  Track the msi registration and hack in a random product id?  Presumably this would break uninstall though?)