I have an Inspiron 5720 with Windows 8/8.1. I upgraded to 8.1 from Microsoft store. As I was installing a program, the computer went black. I have tried to refresh, bootrec /fixmbr, bootrec /fixboot. The message I get when I try to refresh is: "The drive where windows is located is locked. Unlock the drive and try again. How do I unlock the drive?"
Thanks for any ideas.