Re: [update]
Have you taken Restore points? If you've taken Restore points, you should be able to fix this issue by restoring a healthy backup taken before the issue occurred (this will affect system files and programs only), or open the System Restore command prompt and enter "sfc \scannow". This may fix the problem.
The only other option I see is to re-image (reset) your computer. Since you can't access your computer to back up your files, you may need to plug your hard drive into another computer in a secondary hard drive slot and transfer your files off there.
It happened to me too, and the only way that I could fix it was with System Restore.
Good luck Angel.