Note that many websites have their own advertising, unrelated to adware.
This is a codec that is needed to complete the download of movie clips. What really happens is that you are agreeing to an adware and spyware payload. Here are some statements from there EULA:
In return for the right to access this Content, you acknowledge and agree that the Software contains additional software products provided to Codec Cash by its suppliers which will periodically deliver additional Content such as, but not limited to, advertisements and promotional messages to your computer Updates to Software.
You acknowledge and agree that Codec Cash or third parties designated by Codec Cash may from time to time provide automatic programming fixes, updates and upgrades to the Software (collectively, the ?Updates?). Updates may include installation of third party applications, through automatic electronic dissemination and other means.
The information that Web Search Toolbar/Web Search Tools and Win-Tools Easy Installer collects is used to provide website ranking and traffic details for the Webranking service native to the WebSearch Toolbar 2.0. Web Search Toolbar/Web Search Tools and Win-Tools Easy Installer are identifiable in the .Add/Remove Programs.