You will need to do the following.
1. Request your MAC code from AOL
2. Contact BT to sort out the account, they will send you all the hardware and set up disks fairly quickly.
3. Use this link to uninstall AOL
You will need to uninstall AOL completly before loading the BT software. Be prepared to be without an internet connection for a while wislt BT set up your line, usually 3-10 days...