If you try to restart it several times, it will come up with soem more StartUp Repair options. I suggest you take the Command Prompt option and test the hard disk for errors by typing
then hit the Enter key.
That will send the system off to find any errors there are on the disk and try to fix them.
If that doesn't do the trick, go back into Command and this time type,
and hit Enter.
That runs the System File Checker which replaces any missing or corrupted system files. Failing that, you need to reinstall but psot back here before doing that.
MERGED QUESTION Question from Mduduzi Enos : "my pc ran into a problem and needs to restart windows 8.1 lenovo"
I did as you said after 100% complete.
I said, Windows Resouce protection found corrupt piles and an successfully repaired them. Details are included in the CBS.Log windir\Logs\CBS\CBS.log. For example C:\windowsLogs\CBS\CBS.log.. Note that logging is currently not supported in ofline servicing scenarios.
The system file repair changes will take effect after the next reboot.