Unknown Error

If you get the Unknown Error with MS Visual Studio 2017 do thi: I have a same problem after update VS 2017 Enterprise to the build 26228.9. Repair installation doesn't fix anything. Still I got "Unknown error" message immediately after start VS2017. Fixing is possible by removing this folder: "C:\Users\USER_NAME\AppData\Local\Microsoft\VisualStudio\15.0_xxxxxxx"