Note that many websites have their own advertising, unrelated to adware.
Httper is a pop-up opener and error-page hijacker implemented as an Internet Explorer Browser Helper Object. When enabled by its controlling server config.url404.com, Httper will redirect any web server error page to a sponsor's site.
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Can be directed by its controlling server to download and execute arbitrary code as a self-updating feature.
There should be an 'Httper' entry in the Control Panel's Add/Remove Programs feature. This works correctly.