title: git commands not working in git bash (windows 7 x64)
body: <p>I follow the help on 
  <a href="http://help.github.com/win-set-up-git/" rel="noreferrer">http://help.github.com/win-set-up-git/</a>
  for installing git (msysgit) on windows 7 x64.</p>
  
  <p>Everything went good until setting up my account.</p>
  
  <p>But as soon as I tried <code>git config --global user.name ......</code> the git bash always shows me the usage of git, in short the help.
  Every command (<code>status</code>, <code>--version</code>, <code>diff</code>, <code>help</code>, <code>status</code>, ...) shows the same message :
  <code>usage: git [--version] [--exec-path.......] ...</code>.</p>
  
  <p><code>ssh</code> is working well because I could param the ssh key.
  if I type "sit" with a mistake in git : command not found</p>
  
  <p>thanks for your help.
  I think that I may have missed an option in the installation.</p>