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First of all, you will need a bootable disc or pen drive. Although it's not a requirement, to be on the safe side it's recommended at this point that you disconnect other storage devices from your PC and leave only the SSD/HDD that you are troubleshooting.
If that fixes your boot problem, you had it easy and go on to create a restore point for another time you are out of luck. If Windows is unable to fix your issue, Go back to the Advanced options and choose the Command Prompt. Going for the next easiest way to fix the problem, enter the following four commands into the prompt:
bootrec /fixmbrbootrec /fixbootbootrec /scanosbootrec /rebuildbcd
