operating system wasn't found

hi , yesterday i try to move memory from the D: drive to the main C: drive..
i use windows 8 and i try to do it with the partition of windows 8 (win tab +R).
than i shrink the space of the D drive and cant move it to the C drive so finally i just take the shrinking memory and make new drive F.. when i turn onn the computer today i find this error:"operating system wasn't found. try disconnecting any drives that don't contain an operating system".
i dont know what to do..

Just insert your Windows Installation DVD and boot it and perform an automatic repair
Hope that works

http://www.eightforums.com/tutorials/2843-automatic-repair-run-windows-8-a.html