I figured out how XP AntiVirus 2009 worked, and also discovered that it was able to do a stealth install via Firefox on a Windows Box due to the fact XP's SP3 essentially replaced Firefox's depandancy on Sun's Java VM and replaced it with dependacies of .Net Framework.
I also traced the domain for XP AntiVirus down to an address on Queens Road, Belize City, Belize.
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When There's No There to get to, I'm so There!