The User Profile Service failed the logon.
1. I closed down.
2. Turned computer on and immediately pressed F8 repeatedly until I got "Advanced Boot Options".
3. used the down arrow to select "Safe Mode" and pressed enter.
4. computer then opened eventually in the funny look of safe mode, with a "Help" window.
5. In the help window there is an underlined "What is System Restore?" Clicking on that gave me the answer and "Click to open System Restore"
6. I clicked on that and a new window came up recommending restoring to a previous state before windows update which I had done before the fault occurred.
7. I clicked OK and after a bit of whirring all came up OK. Can you imagine how pleased I felt?
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