When I enter the admin password (in any instance, be it for updating software or trying to access and edit system preferences) nothing happens. I know the password is typed in correctly, and all that happens is that the window closes down. The little lock icon is perma-locked, even though I enter the correct password, and I can't use any admin functions. I can't install anything, new or updates.
I am using a MacBook Pro Early 2011 running Lion (10.7.5).
MacBook
Pro, Mac OS X (10.7.5)