If I could, I'd like to suggest using Mercurial instead. It is vastly better supported on Windows, has a simpler workflow, and allows HTTP-based authentication--no SSH keys required. Plus, if you really need git-like flexibility--rebasing and whatnot--it's there in the form of Mercurial patch queues.
Problems:
There is no support user based auth, so you have to set up SSH keys. Pain for our non-techies in the group. You should be able to add users and get access via user/pw/repo url.
Bigger problem is the lack of Windows support. We have 2 people (the non-techies) on Windows and expecting them to learn the command line stuff isn't realistic.