Since Chkdsk and SFC don't fix it:

1. A complete reinstall of the operating system and all files, programs and drivers is required because the operating system has become corrupted.

2. The hard drive has failed and a replacement is necessary, plus the complete reinstall of OS, etc.

On the other hand, I have seen a few such errors when the problem only needed a re-seating of the hard drive cabling inside the case. Shut down the computer, unplug the power cord.... then Unplug, and re-plug the cable from the motherboard to the hard drive. It's worth a try.

Hope this helps.

Grif