Wrong passwd/ username on facebook "friends&q

Hello,
I don't have any problem getting onto facebook, but when I try to "find friends" under
"Friends" and I have to put in my AOL username and password, I always get an error message that the username and or password is incorrect. I know I am putting in the correct infornmation. I have an HP with Windows Vista. Can you recommend any settings or something I may have wrong?
I can log in ok on my daughter's computer (she has a Toshiba). She also has Vista.