I have a friend who is having trouble with her laptop. Ever time she logs in to her computer she gets the error message "The User Profile Service failed the logon. The User Profile failed to load."
Can you check what the service is actually called? I ask because I've been recently looking into the benefits and consequences of running something called "User Profile Hive Cleanup" which installs as a service on machines. At a company I consulted for, we installed this because something was causing their profiles from not closing at logout/reboot/shutdown. After installation, if this service failed, iirc, then the user profile doesn't close on logout/reboot/shutdown, and it doesn't open the profile at next login because it's still 'open'.