I have an admin account, but it's the only account for my computer. I used to have plenty of old accounts, some of which were also admin accounts. When I decided to delete them, I chose to keep the files just in case. Now I realize I don't need them but it won't let me delete them. I went to one topic that stated the same thing. They used a program called Process Explorer. I just downloaded that but I can't seem to find any of the old user's files on there. How can I delete these files?