My windows installation was working perfectly fine until i clicked "Reset BCD" in EasyBCD in Windows 8. After clicking that EasyBCD told me to add Win 8 entry via Add Entry Menu so i did. After restart, win 8 would not start. Neither would recovery F11.

Attempts i made to Restore :

1. Ran boot-repair from ubuntu live cd several time.

2. Used Win8 system recovery disc created via virtualbox with win 8 preview iso.
   

3. Automated repair from Win8 system recovery disc

4. Ran following commands from cmd started from Win8 system recovery disc
   

   bootrec /fixmbr
   Result : Success message
   
   bootrec /rebuildbcd
   Result : after hitting (Y) "The requested system device cannot be found"
   

5. System refresh started from Win8 system recovery disc gives error that device is locked.

6. System reset started from Win8 system recovery disc gives error that required partition or device is missing or not accessible.

7. Used automated repair from EasyRE disc. It gave success message.

8. Used Fix boot problem from Macrium reflect winPE repair disc.

9. Copied Recovery partition to usb. Booting from usb gave this error

   Your PC needs to be repaired.
   Error Code : 0XC000000f
   Press Enter to try again
   Press F8 for Startup Settings
   F8 & Enter does nothing
   

10. I cannot install WIn7 or Win 8, error it gives : "windows cannot be installed on this disk. The selected disk is of the GPT partition style."