rails tidy

I am looking at using Tidy to clean up some html, but having a few
problems running it.

The gem seems to be installed ok,

But according to the rDoc I need to give the path of tidylib.so

e.g.
Tidy.path = '/usr/lib/tidylib.so'

However this file does not seem to exist, any suggestions on what I may
have missed?
(using ms windows)

did you install tidy itself or just the gem? You'll need both...