User, guest, and administrator problems

Hello, recently my laptop has been acting strange. I cannot switch my guest account status away from administrator. When I try to, it proceeds like its going to, then nothing happens. Also I cannot create or delete any user account, or turn off my guest account at all. When in my user account, when trying to turn off guest account or create a new account or delete an account, windows prompts me to enter a password for the guest admin account, in which I never created a password for my guest account, and I cannot create one to solve this problem. Please help!!

Idris Abdul-Latif