For some links with antivirus software you can check
here (yes, this list includes AVG, but also Antivir and Avast, all of them for free).
If you are in this mood, you can find that anti-ad programs are also useful. I recommend
Ad-aware, Spyware or CWShredder (the entire list is at the bottom of the page whose link I give). Better yet, if you have the time, run the three of them.
I bet that if you don't have Opera, as Saribro recommends, you'll find you have a lot of spyware programs installed in your PC without your knowledge. They may not be that harmful, but surely they will slow your internet connection, sending info about your surfing habits.
MC, I am shocked. I've been told you can download porn in the Internet, but I never imagined you doing that!
Seriously, I must be the only guy in the world that has not downloaded the "Pamela video".
Anyway, I always recommend Opera because it saves you a lot of time. For example, you can have the program read aloud a page for you (this is how I "hear" Principessa's news or your posts while I work).
You can also see a list of links to pictures or videos in a page and download them at once
withouth having to right-click every one of them. The download manager, mail, RSS feed and contacts list included in the "basic Opera" save you a lot of time. If you download "pictures" at least you don't spend the entire evening getting them.
I know you can do the same with FF, but I don't like that you have to download a lot of widgets to do the same (and a separate mail client) and then, if you change your FF version you have to download all the widgets again. Does FF still behaves that way?