title: SourceTree cannot access remote repositories
body: <p>I'm using SourceTree v2.3.1 on Windows 7 alongside VisualStudio 2017 v15.3.5. I updated both SourceTree and Visual Studio to these version recently, and possibly as a result of one or both of the updates, I have been unable to use SourceTree to Push, Pull, Fetch or any other operation against a remote TFS/Git repository. </p>
  
  <p>When I try, I get an error like:</p>
  
  <pre><code>git -c diff.mnemonicprefix=false -c core.quotepath=false fetch origin
  fatal: Unable to find remote helper for 'http'
  Completed with errors, see above.
  </code></pre>
  
  <p>I have tried reinstalling SourceTree, removing all temporary files relating to it, installing keys in Putty, rebooting; all to no avail.
  I can perform remote repository operations using Visual Studio's built in GIT client.</p>
  
  <p>Please can you tell me what I need to do to resolve this problem.</p>