I recently upgraded from windows 8 release preview to windows 8 Pro, i did this successfully but after a windows update i tried to boot my computer but it fails. and error code shows up on the new windows boot saying that the hard drive is locked and it cant boot from it. I am unable to refresh or reset the operating system. Luckily my computer also runs windows 7, on a separate hard drive, which i am able to assess the windows 8 hard drive from to get to my files.

Does anyone know what has happened here and how i could fix the problem. I could upgrade windows 7 to windows 8 but i like having a back-up OS for these situations.