|Did you try a System Restore from the Repair Disk?|
Did you try a Start Up Repair from the Repair Disk?
The Start Up Repair replaces the missing boot files and the System Restore finds your Restore Points on your hard drive and uses them to rebuild your system to the way it was at the restore point.
The Third option is for if you made an image of your drive from the Back Up section in Windows 7 or 8 and lets you use that to rebuild the drive to the saved point in history. Combined with a current back up restore, this is a good choice, even if the hard drive is dead and you purchase a new one.
If the first two do not work and you do not have a drive image, you need to suspect that your hard drive might be the problem. Run your hard drive test utility from your hard drive mfg. or Seatools from Seagate to see if your drive is good. Run the Longest test, though it might take hours to complete. If the hard drive is bad, it will need replacing, if the hard drive is good, you MIGHT end up doing a Factory Restore, but first answer with some more details and results in case there is another way. Remember, a Factory Restore will wipe your hard drive completely and restore it to the way it was shipped from the factory. A current back up would restore your personal files, but not your programs and settings.
You have to be a little bit crazy to keep you from going insane.