Hi, I was having similar issues
I did two clean installs, verified integrity, updated drivers/windows, and deleted some CNs folder all to no avail.
Today I did three things which resovled my issue (but I did them all at once so I dont know which)
First,
I did the following fixes (which were posted above)
Second,
I set the launcher and all the .exe "things" in the game folder to run as administrator.
I think it was the last one, running as admin; I vaguely remember having to set that when I first bought the game.