I can't logon. It says User Profile Service failed to logon
Use the Function key or Delete key to stop the machine from booting all the way, in other words, interrupt the normal process. You can try to use the "restore to the last successful boot" selection. If that doesn't work, you can re-install Windows.
What is happening is that windows wants to run the program to let you input the user/password selection and cannot start it. Maybe it cannot find it or the 'file got corrupted' standard Microsoft answer.
Personally, if find that a horrible excuse. Computers are not supposed to corrupt files willy-nilly.
Anyway, you likely have a hard drive dying slowly, and should back up any files you need from the machine ASAP, and then re-install windows.
tom
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