To resolve this problem, restart the computer and try again.
If you begin tapping the F8 key too soon, some computers display a 'keyboard error' message. Continue to do so until the Windows Advanced Options menu appears. Some computers display a progress bar that refers to the word BIOS, while others may not display any indication that this process is happening. The computer will begin processing a set of instructions known as the 'Basic Input/Output System (BIOS).' What you see on the monitor depends on the BIOS manufacturer.
How to Start your Computer in Safe Mode How to Start your Windows Computer in Safe Mode