There may be software on your computer that you don't know about or can't get rid of. Software that you do not want can sometimes be installed on your computer when you install other products or when you surf the internet.
AdAware is a free tool that identifies and removes unwanted software from your computer.
With its ability to comprehensively scan your memory, registry, hard, removable and optical drives for known datamining, aggressive advertising, and tracking components, Ad-aware will provide the user with the confidence to surf the Internet knowing that their privacy will remain intact.
Click this link to go to the AdAware site.
Spybot is another free and recommend tool to identify and remove 'spyware' from your computer.
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