Press the "windows key" plus the R to bring up the "Run" dialog box. Type msconfig.exe and press 'enter' key. This will launch the System Configuration Utility. Step 2, in the utility, click the Boot tab and under Boot options, check the Safe boot box, hit O.K. when done.
Good luck
hi, does anyone know how to turn on safe mode on Windows 8.1 ?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic