1, the computer mistakenly deleted or destroyed the system files. Then the system needs to be reinstalled.
2, may be the installation of software or plug-ins with the system compatibility conflict caused.
You can force the computer to shut down 3 times, and then restart the computer will appear in the recovery interface - select the safe mode - and then the computer will restart into the safe mode, into the safe mode, open the application and features, the recently installed software or plug-ins removed
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Forced shutdown 3 times, and then restart the computer will appear in the recovery interface - select the safe mode - and then the computer will restart into the safe mode, into the safe mode, after the use of security software for anti-virus.
4, may be a disk problem. You need to test the disk, if there is a problem with the hard disk, replace a hard disk can be.