CleanPreview4.ps1

# Setup assets
$foldersToDelete = ,"$env:ProgramData\Microsoft\VisualStudio\Packages"
$foldersToDelete += "$env:AppData\Microsoft\VisualStudio\Packages"
$foldersToDelete |? { Test-Path $_ } |% { del -rec -for $_ }

# VS assets
#   Any VS installation folders
if (test-path $env:ProgramData\Microsoft\VisualStudio\Packages\_Instances) {
    gci $env:ProgramData\Microsoft\VisualStudio\Packages\_Instances -filter state.json -recurse | gc -raw | convertfrom-json | select -expand installationPath | del -force -recurse
}

if (test-path "${env:ProgramFiles(x86)}\Microsoft Visual Studio") {
    del -rec -for "${env:ProgramFiles(x86)}\Microsoft Visual Studio"
}

del -rec -for $env:localappdata\Microsoft\VisualStudio\15.0*,$env:AppData\Microsoft\VisualStudio\15.0*

reg query HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\VisualStudio\ | findstr 15.0 |% { reg delete $_ /f }
reg query HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft | findstr VisualStudio_ |% { reg delete $_ /f }
Reg query HKEY_CURRENT_USER\SOFTWARE\Microsoft\VisualStudio | findstr 15.0 |% { reg delete $_ /f }

# Remove all VS singletons
# get-package vs_* | uninstall-package
get-package -provider msi | where { $_.name -like "vs_*" } | uninstall-package -additionalArguments "IGNOREDEPENDENCIES=ALL"

This script cleans up all remnants of Visual Studio "15" Preview 4. Use this prior to installing Preview 5 if you're experiencing problems with installation.

wow, this is good.

So I HAVE VS17 installed, but a few components didn't install because of a corrupt VS16 install.

So, since I already have VS17 installed, do you recommend uninstalling VS17, running this script, then reinstalling VS17?