Like the rest of you, I've spent days trying to figure this out. I've been down this thread trying every combination of what you have all said, and nothing. I finally went to AppData/Local/Microsoft/VisualStudio and deleted all the folders in there. Then proceeded to turn off everything in my Anti virus and I finally got the basic installation to go all the way through. Frustrating, but hopefully this will help someone else who has tried everything.