I've had difficulty getting Git to cooperate with WordPad, Komodo Edit and pretty much every other editor I give it. Most open for editing, but Git clearly doesn't wait for the save/close to happen.
As a crutch, I've just been doing i.e.
git commit -m "Fixed the LoadAll method"
to keep things moving. It tends to keep my commit messages a little shorter than they probably should be, but clearly there's some work to be done on the Windows version of Git.
The GitGUI also isn't that bad. It takes a little bit of orientation, but after that, it works fairly well.