SFC /SCANNOW not working no matter what I do?

Hi there,

Before anything else, I want to mention i'm running Windows 8.

I'm having problems running the resource checker on my computer. When I do the usual command prompt sfc /scannow
I get this error: 
Windows Resource Protection could not start the repair service.

I did some browsing, and people said this command works:
sfc /scannow /offbootdir=c:\ /offwindir=c:\windows

but when I use it, it doesn't scan... It just lists the command prompts I can use for the scan. I'd give a screen cap, but I can't figure out where to verify my account...

So, again, after it lists the available prompts I type sfc /SCANNOW 

Same error comes up.

I'm completely and utterly confused. Any help would be much appreciated.