title: How to find the UpgradeCode and ProductCode of an installed application in Windows 7
body: <p>I have an application installed on my machine. I also have its source code but somehow the ProductCode and UpgradeCode of this application were changed.</p>
  
  <p>Now I want to get the UpgradeCode and ProductCode of this installed application.  I feel there must be some tool for this. </p>
  
  <p>Can anyone kindly let me know how to get the UpgradeCode and ProductCode of an installed application?</p>