Downloading PC Optimizer Pro from a general software website.
Deliberately downloading PC Optimizer Pro isn't always necessary, since these websites may employ drive-by-download scripts to force you to install PC Optimizer Pro. Our team of malware analysts has found that these websites, in addition to presenting highly inaccurate information that makes PC Optimizer Pro look like a great product, also universally abuse search engine algorithms to jam themselves up into the top of your search results. The most prominently-visible of these PC Optimizer Pro websites include, and. Visiting a website that's linked to PC Optimizer Pro or other scamware products.
These Trojans include Zlob and Fake Microsoft Security Essentials Alert, both of which are known for disguising themselves as fake codec updates.