Boot into Safe Mode in Windows

How to Boot into Safe Mode in Windows 10, 8.1, 8, 7, XP, Vista or Earlier Version?

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, see Diagnostic tools to use in safe mode.

See Microsoft Official link to Boot in Safe Mode

http://windows.microsoft.com/en-in/windows/start-computer-safe-mode