If you're having problems with darcs I would recommend using the darcs-users mailing list:
http://lists.osuosl.org/pipermail/darcs-users/

It would also be nice to know more about your setup (darcs version, ssh tools, what steps you've taken to configure darcs/ssh).

The darcs wiki also has some information about windows:
http://wiki.darcs.net/WindowsConfiguration

Since it's a wiki it's possibly in need of updates but as I don't use windows I can't really say (or accurately update it).

I hope that helps,
Jason