Error message 'Value cannot be null. Parameter name: userContext' in Visual Studio 2017

I had same problem to. My solution is quite similar from Tahir Hassan.

Go to ...AppData\Local\Microsoft\VisualStudio\15.0...\ delete the file "privateregistry.user.bin"
Start Visual Studio -> VS only ask to sign in or not.

You don't have to download any updates after that.

I had this problem. Close VS, go to %LOCALAPPDATA%\Microsoft\VisualStudio\ and delete/rename a folder whose name starts with 15.0_.

Then start Visual Studio, then download and install the latest update.

After that it should work - Best of luck.

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