This is exactly the help I've been needed. I could not figure out that it was Teamviewer causing this issue and all my Google searches were coming up dry. The pc I'm plugged in to doesn't have a monitor so as you suggested I just plugged in a USB-VGA adapter and it started working perfectly. Can't tell you how many times I ran SFC/DISM which sent me off on a wild goose chase because SFC kept saying it was fixing errors... and it's a brand new computer!
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