I have a number or problems with Windows 10. I just did the upgrade from Windows 7.
1. The login screen freezing up.
I got this to work by luck. You have 5 to 10 seconds to going into msconfig to put into safe mode. In safe mode I run my anti rook kit software and found 1 root kit virus...
anti malware
antivirus
control panel
cortana
login issue
mobile app
msconfig
pc problems
root kit
safe mode
settings
system settings
timeout
troubleshooting
upgrade
user experience
user interface
virus removal
windows 10
windows defender