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Stupid Paypopups
Maybe you have spyware on your computer, try scanning with AD-aware (http://www.lavasoftusa.com/products/ad_aware_free.php)
You should also make sure you've installed a filter for you adblock (https://addons.mozilla.org/en-US/firefox/addon/1136)
I guess a certain site could just have really annoyng sponcors. Maximum pc november 07 had a nice section on cleaning and inoculating pc's. even covered stuff like root boxes. They havn't posted it on their archive yet though. $9 in stores or: http://www.maximumpc.com/articles/PDF%2BArchive
hope this helps and good luck