title: How to make vcredist_x86 reinstall only if not yet installed?
body: <p>In my inno setup RUN selection I force silent install of MSVCRT. I wonder how to make it install itself only if not yet installed?</p>
  
  <p>This is what I call now:</p>
  
  <pre><code>Filename: {tmp}\vcredist_x86.exe; Parameters: "/passive /Q:a /c:""msiexec /qb /i vcredist.msi"" "; StatusMsg: Installing 2010 RunTime...
  </code></pre>