Windows 10 Can't log in after new update.

[Wite]

So,a bizzare bug happened a bit ago,still having trouble fixing it.
My friend can't log into her pc.
It accepts the password,it goes to black screen for a bit,then boots her back to the login screen again.
Restarting doesn't work.
Can someone please help,im not really sure why is it happening.
(Happened after the newest update)

 

[Neemobeer]

You can try booting into safe mode or the recovery console and try uninstalling the last update installed. If this was an upgrade and not an update. Boot to the advanced start up menu (press F8 repeatly during boot) and select Advanced > Recovery > Rollback