Error HRESULT E_FAIL has been returned from a call

Question

In VS-2017, onclick add Reference I am facing an error:

"Error HRESULT E_FAIL has been returned from a call to a COM component."

due to which I am unable to

1-add any reference and 
2-update my database through DB_First Approach

This issue is occuring from the last update of windows in my PC

Answer 1

I had done many solutions given on Internet

This link helped me a lot: https://developercommunity.visualstudio.com/content/problem/260196/add-a-reference-raise-error-error-hresult-e-fail-h.html

Steps:
1-Open "Developer Command Prompt for VS 2017" as Admin
2-CD into "C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\IDE\PublicAssemblies"
3-Run "gacutil -i Microsoft.VisualStudio.Shell.Interop.11.0.dll"
 After that close and reopen "Developer Command Prompt for VS 2017" as Admin
4-cd "C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.6.1 Tools\x64"
5-Run -> gacutil.exe /i "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\PublicAssemblies\Microsoft.VisualStudio.Shell.Interop.11.0.dll"
Microsoft (R) .NET Global Assembly Cache Utility. Version 4.0.30319.0 Copyright (c) Microsoft Corporation. All rights reserved.

Assembly successfully added to the cache

Restarting your PC will solve the problem