If you try to use the launcher, you crash your PC and lock up totally.
The only solution was to launch directly from the WoW folder and bypass the Bliz launcher.
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I too am not getting past the launcher . Battlenet isn’t letting me in, as soon as I try anything I’m frozen! 
This morning, I was able to use the launcher and got in fine. Logged out for a bit, came back and it started locking/crashing again. Back to doing a work around instead of using launcher.
I uninstalled Bnet for now cause I couldn’t get past it to uninstall beta. Loading in old school here too thr the files >authentication numbers… lol - do you have beta also?? No one w/o it that I know are having these issues… maybe a beta thing??
I had this problem a few days ago, I had to update my graphics card driver and it fixed it.