To access Safe Mode in Windows 8, you need to do so via the Advanced Startup options menu. To restart your computer into the Advanced startup options menu, go to the Windows 8 Start Screen and type Advanced. When the search results appear click on the Settings category.
Now click on the option labeled Advanced startup options and you will see the General PC Settings screen. Scroll down to the bottom until you see an option labeled Advanced startup.
Click on the Restart now button and Windows 8 will restart your computer and go directly into the Advanced Startup options menu.
Then click on the Troubleshoot button and then the Advanced options button. This will take you to the Advanced options screen where you should click on the Startup settings option.
At the Startup Settings screen, click on the Restart button. Your computer will be restarted and brought into the Startup Settings menu as shown below.
You can start Safe Mode in Windows 8 from this screen. There are 3 possible Safe Modes options that you can choose from.
Choose Enable Safe Mode with Networking