Making MacBook command-key the Emacs meta-key under VMware/Windows
To get Emacs on Windows to recognize something other than the Alt as the meta key is hard.  

However, you can easily remap any keys on the Mac keyboard, including modifier keys, to be any other keys on the Windows keyboard via Fusion.  I have my ⌘ key mapped to Ctrl on Windows.  So one way to make the ⌘ key your meta key is to map ⌘ to Alt.

In Fusion 5, Select Virtual Machine -> Settings... -> Keyboard &amp; Mouse. That will bring up a list of profiles you can select from, duplicate, and edit.  Hopefully it's obvious from there; if not, consult the built-in help by clicking on the question mark on the lower right of the Keyboard &amp; Mouse panel.