Run chkdsk (just type chkdsk + enter) from the command prompt in the System Recovery options. See http://www.vistax64.com/tutorials/194765-system-recovery-options.html for how to get there.
If it fails there also, something is wrong with the hard disk. Then run the manufacturers diagnostics.
I ma doing CHKDSK for my computer, but it stopped at stage 5
the final line says:
93 percent complete. (15413980 of 16724875 free clusters processed.
THis is all what I have with a black screen.
Can you help ?