title: "The Silverlight 4 SDK is not installed" error, after updating Visual Studio 2012
body: <p>I have just installed the Update 2 for my Visual Studio 2012 Ultimate.</p>
  
  <p>After installing the update and restarting the computer, I am not able to build Windows Phone  projects anymore. When I try to build them in VS I always get "The Silverlight 4 SDK is not installed" error.</p>
  
  <p>I have checked, and the SDK is installed. I have also tried by repairing the installation, but nothing. It was working ok befor installing the Visual Studio Update</p>
  
  <p>Does anybody know which is the cause of the problem and how to solve it?</p>
  
  <p>Thanks in advance.</p>
  
  <p>EDIT: I have uninstalled and installed again Silverlight 4 SDK with no result. I have checked the Windows Registry, and realized that there is no entry for Silverlight under "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SDKs". Could this be the problem? How do I solve it?</p>