i have a WIFI ready 2007 macbook Pro. i have my WIFI set up and my ISP is good to go. when i click on my network, I'm asked to enter the password. fine. done. then I'm asked to enter another password to allow Mac OS X to make changes. I don't know what that is. this is my first MAC and my first laptop. WIFI is brand new. sorry. i'm a little green. can somebody tell me what to do? i bought this laptop used. thanks so much in advance for your help.