Note that many websites have their own advertising, unrelated to adware.
Popular domain names are being directed to rogue servers through an attack dubbed "DNS cache poisoning". Upon landing on these web addresses The ABX toolbar gets loaded into the PC. This appears to happen via an ActiveX control embedded in multiple iframes.
ABX is a Browser Helper Object (BHO) that displays a large number of unlabeled pop-up ads. Search Page/ Start Page of Internet Explorer are also modified.
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Active-X Control installation can be vaccinated against by using the Free SPG Blocklist at http://www.spywareguide.com/blockfile.php