If you're using Firefox, you might want to look into getting Adblockplus and Noscript. ABP basically lets you block any picture, ad, or similar and has a blacklist of any nasty kind of ad that would try and do anything. Noscript on the other hand goes further and doesnt allow scripts to be run unless you allow them, like google ads (while harmless) or similar programs. It also gives you a good overview of different sites and what background scripts and things they run.
If anything would happen to get through, Spybot Search & Destroy can both immunize and remove most adware. If you want even further protection, try Spywareblaster as well, although not sure if you need anything else.
If there's a problem there, Hijackthis can kill most nasty programs, and give you a list of all strange/unknown programs or files currently running.
Besides that I don't really have a virus program besides Kaspersky which I run every now and then, but if I get a problem it's usually easily removed by Combofix.
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Am I paranoid? D:
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