You should see directly below that, 2 drives - Local Disk C: and Local Disk D: (or some other drive letter)
are they there?
Yes they are there. I know I should clean it out by deleting files I do not need but I do not know how to determine which files I can safely delete . Is there a website that has a list or will help ;you determine which ones you can delete? How do you find out what the individual files do?