Using autotest with rspec on windows XP

I have been trying with RSpec 1.0.5 in Windows XP for learning something
about BDD.
Then installed zentest 3.6.0 and try to use autotest to run the
specification examples, and it seems that they run, each time I change a
file I see the command to be executed in the console, but nothing more,
there is no output with the results in the console.
Without autotest I use rake and all the specifications run without
problems, I have installed the win32console gem, and rspec produces even
coloured results.

I will appreciate if somebody can tell me something about this.
Thank you

Juanma C.