VIsual Studio 2015 not starting

Today I had an issue with Visual Studio 2015 not starting today after installing some updates in Visual Studio 2013, so I did some googling about how to diagnose issues with Visual Studio.

Visual Studio can actually write logs about its activities if you run it via:

devenv.exe /log

This causes VS to start logging to:

"%AppData%\Microsoft\VisualStudio\[Version]\ActivityLog.xml"

In my case VS 2015 is version 14, so I was looking in:

c:\Users\[account]appdata\Roaming\Microsoft\VisualStudio\14.0

Looking in the logs there was a log entry at ERROR level:

"No InprocServer32 registered for package [Async Query Service Package]"

My guess is the VS 2013 update messed with the dll for that package.

The resolution to this problem was to get VS 2015 to reinitialize itself by running this as an administrator from the Visual Studio command prompt:

devenv.exe /setup