Trying to get set up with Visual Studio and git

I'm struggling through getting everything set up here, I have my extension installed in visual studio 2010, and everything seems开发者_开发技巧 to be set up except it fails when I try and commit changes. I'm using github and it fails on the push because it's saying I don't have the private key installed. Where do I get this private key from for putty?

Specifically it asks for a ppk file, this was never generated that I can see. I tried copying and pasting the private key generated into a file and gave it a ppk extension and it said it couldn't load the key.

You can generate the ppk key from Puttygen