HELP!! Windows.old folder not in disk cleanup!Windows 10 upgrade! Taking TOO MUCH space!!!?

I have a very small c drive so I want to save space. I tried to delete the windows.old folder through file explorer but it gave me an error. I even tr

I have a very small c drive so I want to save space. I tried to delete the windows.old folder through file explorer but it gave me an error. I even tried via disk cleanup but it doesn't show up there. I had installed a safety software named 360 total security and it told me to delete the windows.old from there. At the end it said that 18.9 gigabytes were deleted but really only 2 gigs were gone. Pls Help!! I even tried via cmd but it said "permission declined". Another person told me I could be dual botting. What is dual booting and how do I see if I am dual booting. I wont mind giving it a try via CMD again. CMD IS COMMAND PROMT

or:I have a very small c drive so I want to save space. I tried to delete the windows.old folder through file explorer but it gave me an error. I even tried via disk cleanup but it doesn't show up there. I had installed a safety software named 360 total security and it told me to delete the windows.old from there. At the end it said that 18.9 gigabytes were deleted but really only 2 gigs were gone. Pls Help!! I even tried via cmd but it said \"permission declined\". Another person told me I could be dual botting. What is dual booting and how do I see if I am dual booting. I wont mind giving it a try via CMD again. CMD IS COMMAND PROMT

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