For erasing your privacy risks [this risks are mainly belongs to the Internet Explorer] there is no need of buying this app.
Just follow this simple steps to do it:-
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open the Control panel of your PC.
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go to Network and Internet and open Internet Option.
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open general and look at the browser history section.
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click delete browsing history on exit.
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click Delete and chose what are the items you want to delete.[you can chose all the items also] and click delete.
6.click on Exit button on the top of right side of window. [don't click on OK or Apply]
Re-scan your PC at Wise Care 365 to see the result.