Jon8RFC's ad-removal patches for the AIM 5 series
FIRST, check your version of AIM. At the top of your buddylist, click on Help > About AOL(R) Instant MessengerTM...
Before running the patcher, bring your buddy list forward by clicking on it once, then hit Ctrl + Shift + F4 at the same time.
(This is the best way to ensure that AIM is 100% exited. If you don't exit the way I've explained, the patcher probably won't work.)
Be sure to click on Read Instructions in the patcher if you have any problems : )