title: Visual Studio 2015 update 3 not installing (no error or feedback)
body: <p>Visual studio 2015 update 3 doesn't install. Running vs2015.3.exe briefly extracts some files then does nothing (no install splash screen, no feedback, no errors, literally nothing). Manually extracting the files and running 'SetupLauncher.exe'  similarly does nothing. Running it as administrator does nothing also.</p>
  
  <p>I have uninstalled any previous versions of .NET Core and tools previews to no effect.</p>
  
  <p>Does it log errors anywhere? (I'm running Windows 7 Enterprise x64)</p>