

You need to press F8 before the Windows logo appears.

Press and hold the F8 key as your computer restarts.Click the Start button, click the arrow next to the Shut Down button, and then click Restart.Remove all floppy disks, CDs, and DVDs from your computer, and then restart your computer.Pre How to start Windows in safe mode (in short)

What to do when you get "The User Profile Service service failed the logon.
