Your ISP might have already asked you to do this, but then again . . .
If it works okay with a new download of AOL, have you tried removing your ISP info and then downloaded it again to reinstall?
Sorry, I don't know enough about anything to offer any real help. I just noticed you didn't mention having tried doing this yet, so if nothing else you could get it out of the way when someone else asks you before you move on to try another solution.
I transferred all my data from old computer to new computer, but now the ISP that I was using keeps giving me a 633 error msg. saying modem in use by another program. Sorry for being so dumb, but appreicate any help, because my ISP people can't seem to help me. I downloaded AOL with no problem, just so I could get connected, but still can't connect with old ISP of who I have 12 mths contract and can't get out of.