Please forgive if this is obvious - I haven't used Windows for decades - and it's fallen on me to sort out an old laptop with Windows 8 installed. When I open 'Properties' for 'Windows (C:)', it shows that the disk is 110GB, of which 56.8GB is used.
However, when I open 'Properties' for all the folders under 'Windows (C:)', the sizes don't add up at all - they only use about 20GB. I've tried logging in as Administrator, and I've shared the disk folder, mounted it as Administrator from Linux and run du -sh *, and still get the same result. IS there any way in which I can see what is using all the space?