My windows 10 pro auto updated 2 days ago and when I boot up the past 2 morning the logon screen with the 4 little blue windows looks like they have been shot with a shotgun and it never boots up. I have to shut it down with start button and restart before the machine will boot-up completely. I was having this problem back when I first upgraded to 10 but forgot the process I had to go through to force a first time boot-up.