Get rid of what? I'll give you two answers, because I'm really quite a nice person at heart:
1 - Getting Rid of Zonealarm
Firstly, EZ Antivirus is, funnily enough, an Antivirus program. It is not a firewall. Ditto for your pop-up blocker. If you're trying to get rid of Zonealarm, use the Add/Remove Programs dialog in the Control Panel - if you want rid of a virus, you use your Antivirus app to sort it. Not difficult.
2 - Getting Rid of The Adverts
My wording wasn't strong enough, was it? Let's see what Geocities have to say:
2. DESCRIPTION OF SERVICE
You also understand and agree that the Service may include advertisements and that these advertisements are necessary for Yahoo! to provide the Service.
You acknowledge, consent and agree that Yahoo! may access, preserve, and disclose your account information and Content if required to do so by law or in a good faith belief that such access preservation or disclosure is reasonably necessary to: (a) comply with legal process; (b) enforce the TOS; (c) respond to claims that any Content violates the rights of third-parties; (d) respond to your requests for customer service; or (e) protect the rights, property, or personal safety of Yahoo!, its users and the public.
You understand that the Service and software embodied within the Service may include security components that permit digital materials to be protected, and use of these materials is subject to usage rules set by Yahoo! and/or content providers who provide content to the Service. You may not attempt to override or circumvent any of the usage rules embedded into the Service. Any unauthorized reproduction, publication, further distribution or public exhibition of the materials provided on the Service, in whole or in part, is strictly prohibited.
There's more in the Terms of Service too, but I think that'll do for now