Starting a computer in safe mode is a useful diagnostic tool  

Safe mode starts Windows with a limited set of files and drivers. Startup programs don’t run in safe mode, and only the basic drivers needed to start Windows are installed. For more information.
Safe mode is useful for troubleshooting problems with programs and drivers that might not start correctly or that might prevent Windows from starting correctly. If a problem doesn’t reappear when you start in safe mode, you can eliminate the default settings and basic device drivers as possible causes. If a recently installed program, device, or driver prevents Windows from running correctly, you can start your computer in safe mode and then remove the program that’s causing the problem. For more information about troubleshooting problems in safe mode

— http://windows.microsoft.com/en-au/windows/start-computer-safe-mode#start-computer-safe-mode=windows-7

But how do you start a Windows 8 computer in safe mode ?

Checkout this article from How To Geek

How to boot into safe mode in Windows 8 

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