windows hides system files and such so users don't accidentally delete the wrong things
To see them, open file exploder
select the file button
select options
select the view tab
in the list there is a folder called Hidden files and folders with 2 choices,
the first (default) is Don't show hidden files and folders
The other is show hidden files and folders - this would be one you want
Always helps to set them to hidden again once you finished fining the folder you want.