Quote Originally Posted by Risvertasashi View Post
This is a nasty one. Got it once and I'm still not sure what fixed it. Just tried everything in those googleable posts, more than once, only started working again when I stepped away for 30 minutes and came back.

Do try the "right click > run as administrator" one though, that's easy enough.
Yeah I've run as admin a few times and it hasn't ever worked. It's a pain in the ass; I used to get it on my desktop but it would work just fine after closing the launcher and trying again.