Windows 8 Problem Black Screen with movable cursor

Please help

Here's the story:

My cousin played minecraft on my laptop for maybe an hour. Then later, he told me that my laptop froze, so he turned it off by holding the switch. When we turned the laptop on again, it took a long time before it got past the boot screen. Then here comes the problem. After the boot screen, the screen was just blank, but with a cursor. Then I waited, but nothing is happening. So I restarted the PC, then the boot screen has now a "Preparing Automatic Repair" text below the buffering circle. The boot screen went off immediately but the same thing has happened. Then I tried the Windows 8 Installation disc. I tried reinstalling, but I waited for like 5 hours, and the screen is stuck at "Setup is starting..". It didn't work. So I tried "Repair your computer" . I tried Refresh, but it says "the drive where windows is installed is locked. Unlock the drive and try again." But I don't know how to unlock the drive. So I tried Reset, didn't work either. Tried Automatic Repair, but it was stuck on the "Diagnosing your PC.." screen. Tried command prompt and used bcdedit and chkdsk commands, but again, it didn't work. I want to update the BIOS, but how can I if it won't go to the desktop? I've googled the best that I can and I can see many people having the same problem as I have but were not resolved.

If there are solutions where I don't have to reformat my laptop, then I would really appreciate it.

So here are the Specs of my laptop:
NP300V5A-S05CA - TECH SPECS | SAMSUNG
It is kinda slightly overclocked but I am confident that it's not the reason why this problem occured. Dual-boot with Windows 7 (which I don't know how to access since it won't go to the OS selection screen.)

I know this problem can be resolved. Thank you for those who will help me fix this problem!

Anyone? help?

I'm having the same problem as well. After the swirly windows 8 logo it just goes to a black screen and lets me move the mouse cursor. Can't go into safe mode or log in with the black screen up. help anyone?

Check my response in Khaos' post, should be the same solution. You'll have to run a DISM command.

In addition to the dism command as suggested by XweAponX

Dism /Online /Cleanup-Image /RestoreHealth

IF you have restore points from before this mess, you could try :

rstrui.exe

to pull up recovery options.

Good luck.

I have yet to come across this kind of Black Screen o Deth on any legitimately activated Windows 8 or 8.1, the two systems where I fought this were hacktivated with a KMS emulator, which I removed and the problem went away.

Doing a system restore back to the day before it happened if such a point exists should fix it too, you can do that from an Install Disk or from the F8 advanced troubleshooting options.