Undeleted Administrator And Standard User Folders

Recently, I set up a test administrator account and a test standard user account. Having served their purposes, I deleted them--or so I thought. Now, when I go Computer > C: > Users, I still see both of the user folders. When I try to delete them, I am told that I need administrative permission, but I am logged on as an administrator, specifically, the original administrator on the computer. Perhaps I need to take ownership of the folders in order to delete them, but I have not had to take ownership in such a long time that I am hesitant to do so without hearing from others--that taking ownership is the right path to deleting the folders. I know that we have a "take ownership" tutorial so I can check it out if need be.

I also have the option of stopping sharing of the folders--which would work a little since one or both still show up as shared folders on my network in a place or so. Probably this part of what I have typed is best ignored since stopping sharing won't delete the folders.