Zentest on Windows 7

I am trying to install Zentest on windows 7. I have followed through
all tutorial but it does not work for me.

Now I get the error:

ruby.exe: No such file or directory -- C:/Ruby/bin/autotest
(LoadError)

I have install Zentest and the other required gems then I cd to my
rails project
C:\Ruby\myframework
then types autotest

nothing happens

Does it work on windows 7