Step 1 Rename (or delete) advert.ocm. If renaming, rename to advert.old.
Step 2 Go to the AIM Directory, and open aim.odl in notepad (or any other program of your desire). The following line occurs twice: load_ocm advert required. Delete the required text, then hit save. The ads shouldn't be there anymore.Step 3 However, if the ads weren't remove, do as the following tells you. In the AIM Directory, open netwait.odl with notepad. Find the file, on_group(5){load_ocm advert}. Delete the entire string. Do the same thing for the following string: on_group(11){load_ocm advert}. Now it should surely work.
(taken from tim.only.com)