I'm hoping this is my answer to better rails development on Windows (I've been having trouble with cucumber and a few different gems). Unfortunately, 64-bit windows isn't supported. Hopefully running as a 32-bit app through xp mode will work.
After looking into is a bit more, it seems a bit out of date. Cygwin may be a better solution: <a href="http://www.cygwin.com/" rel="nofollow">http://www.cygwin.com/</a>