I get error message
'Value cannot be null. Parameter name: userContext'
in Visual Studio 2017 when trying to click notification or opening Extensions and updates from tools folder. Before answering can you look this Answer. The answer did not work on me.
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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