Hi
I tried Winderstat as Paul Simpson suggested.
By the way this is a great program, thanks Paul.
Here is what I found...
As you can see, the hiberfil.sys file is what's using the space.
It alone is 25.6 Gigabytes.
As I understand it this is the files that stores my computers status when it's told to sleep.
I guess that brings up the question, how can I make this file smaller?
What happens if I delete it, assuming that, that is possible?
PS. I ran a search for hiberfil.sys and found it int the root directory of C:\.
However it is not visible in Windows Explorer even though I have show hidden files and folders selected.
As you can see the specs for it show it as a 25 Gigabyte file.
So this does seem to be where all my space is being used.
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I found some more information, it appears that the size of the hiberfil.sys file relates to the amount of ram you have on your computer, the more ram you have the bigger the size of the file.
My computer has 32 Gigabytes of ram, so that is apparently the reason that my Windows install is so large.
By default Windows makes the file big enough to hold everything that could be stored in you ram.
It seems that the only way to get rid of the file it by disabling hibernation, and I'm not sure that's a good idea in Windows 10 at this point, I see that in Windows 8 it can be done from the command prompt.
Since I can live with it the way it is, it's probably better for me not to mess with it.
Mike