It keeps telling me that I can't log in because "you are already logged in". And I am clearly not logged in on either of my accounts, because i can't use anything. What is going on.
Quit Skype or use Windows task Manager to kill any Skype.exe process. Go to Windows Start and in the Search/Run box type %appdata%, press Enter or OK button. The Windows File Explorer will popup. Locate there a folder with the name Skype. Rename this folder to something different, e.g. Skype_old. Restart Skype.