I had this problem too, very similar. First I fixed mostly with this
PROFIT!
Problem solved, imo no full reinstall needed, just modify VS installation, and keep only the latest Win10 SDK (uncheck old version, apparently UE4 uses it for pch creation somehow, but the latest for everything else, but I’m not a pro, just guessing)
Did that and also installed from here:
This two things leave me create the project but then I got the same issue that you had.
Then I found this:
https://www.reddit.com/r/unrealengine/comments/6r5imo/what_should_i_do_whit_this_error/
Apparently I coudnt compile the project when I created a new one because I had it on:
C:/Users/Ignacio Olazábal/Documents/Unreal Projects/
That á was the problem
So I created it on:
C:\Unreal\Projects
And the errors disappear. I still don’t understand how I could not create a project with a folder with an special character. But is what it is.
Hope that some of this odyssey helps you 