The offending code is typically included in a bundle of programs that come with free downloads of legitimate programs. Users who choose an automatic installation option or don’t pay close attention to the installation process can end up with software that they didn’t ask for and don’t want.
And yessearches.com can be difficult to remove. You can’t just click to your program list and tell Windows to uninstall it and it’s not targeted by most programs that screen for viruses and malicious ads.
The folks at MySpybot have created a simple walk-through that explains how to remove yessearches.com. find the .exe file that runs the yessearches adware and how to remove yessearches from Firefox, Chrome and Internet Explorer browsers. The article explains how yessearches.com, what to look for and the steps needed to banish it.
For the full story, check out this article on the Spybot blog.