1. Run Command Prompt as Administrator
2. Copy and paste this command then press Enter: 
    bcdedit /set {default} bootmenupolicy legacy
3. Reboot your PC
4. Before anything appears on your screen, press F8 repeatedly until the 
    Boot Options menu is displayed. Then select 'Safe Mode'
5. Your PC should now boot into Windows Safe Mode. If you want to exit, just
    restart your PC and by default, normal Windows should boot.