Booting into Safe Mode, Windows 10
Booting into Safe Mode is easier and harder in the newer versions of Windows. In the past, you had to power on the PC and repeatedly press the F8 key right after the BIOS splash -- and hope you pressed the key at the magic time.
Now, choose one of these two methods:
1. Cold-boot the PC.
2. Immediately after the BIOS splash screen (if displayed), but before the Windows splash, press and hold the F8 key.
1. From a booted PC, press and hold the Shift key.
2. Click "Start, Power, Restart"
3. Once in the Recovery Environment, select "Troubleshoot", then "Advanced Options".
From the Startup Settings, select Restart
Upon restarting, you will see a list of options. Choose F5 (option 5) for Safe Mode.