this version of rhc is designed to be run in windows or linux natively.

Here's how to get it to work.

Step 1) Install msysgit - http://code.google.com/p/msysgit/downloads/list

Step 2) Install RubyInstaller for windows - http://rubyinstaller.org/downloads/

Step 3) Start -> All Programs -> Git -> Git Bash

Step 4) gem install --source=http://mmcgrath.fedorapeople.org/rhc/ rhc

Step 5) rhc

From that point everything should be done.  You can even run the rhc tools from a regular cmd prompt though.  All in all it should prove to be a much better experience.