I'm no fan of that OS but still some people are working with it - so here is a short installation tutorial for working with git on a ms windows machine.
You have to install three software packages:
clone a git repository and add a file to the local repository...
commit local changes to the local repository and push the changes to the iis server. check for update with git pull.
Create a local repository - open Windows Explorer:
Repository Settings (right click and go to repository settings)
right click on the directory (git repository)