Windows 8.1 update.... black screen

Hey there,

Heres a little back story just in case any of this matters... I recently purchased an Alienware m11x from a friend. It was in good condition and was running fine, another friend asked if he could install Ubuntu on it, he re-partitioned the drive one half windows 7 and the other half Ubuntu... no problems there was working fine. After about a week I decided I wanted get rid of Ubuntu, I attempted to un-partition the drive and get rid of Ubuntu... in the process I was left with a error.

Next I got a copy of Windows 8 which my college provides and put it on a USB and booted the computer from there and had windows 8 running.... Everything worked fine until I restarted the computer, after restart I would get stuck in a black screen where my mouse pointer was the only thing visible... I've attempted so many things and nothing has been working, I'm not the best with computers but I'm learning...

Does anyone know how I can start fresh with windows and avoid the black screen, and maybe eventually re-install the original Alienware software???

If you could respond soon that would be great, if I solved this problem I would be beyond happy!

Thanks