C drive properties

When looking at the C drive, all I can account for is about 30gb, yet properties says 84gb used.

Why the discrepancy?

HonorGamer said:

What do you mean that you can only "account" for the 30GB?

When I look at all the names ( users, programs, etc) they all total up to about 30gb.

HonorGamer said:

Well remember, there are also background programs that run. Have you been through your Programs and Features to look at all of your installed programs?

No, I haven't.
But are you saying that background programs could account for 50gb?

HonorGamer said:

Have you also included windows files? And have you cleared out your temp folder? I know this isn't gonna take up 50GB, but it could clear out some. Not all the time, everything you see my adding it all up will be exact with what windows is saying.

I have no idea what your last sentence means.

HonorGamer said:

When you "account" for all of your programs and such. Most of the time it won't be the same as what Windows will say it will be. Yes it could be a glitch in windows, but it could also be that there is more on your computer then you think.

If I look at all files that show on C drive - they only add up to 30gb.
That is why I am confused.
Wouldn't everything on my computer show on C drive - as in the pic?