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Visual Studio Online is now Visual Studio Team Services 
Jesse Houwing 23 Nov, 2015
C:\Program Files (x86)\Microsoft Visual Studio\Installer\resources\app\layout\installcleanup.exe
Which will perform the same actions as the good old “vssetup.exe /uninstall /force”. If that doesn’t get you unstuck, there is an even more forceful way:
Delete everything under:
C:\ProgramData\Microsoft\VisualStudio\15.0
C:\ProgramData\Microsoft\VisualStudio\Packages
%appdata%\Microsoft\VisualStudio\15.0*
%appdata%\Microsoft\VisualStudio\Packages
C:\Program Files (x86)\Microsoft Visual Studio\2017
HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\15.0*
HKEY_LOCAL_MACHINESOFTWARE\Microsoft\VisualStudio\15.0*