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:-
open the Control panel of your PC.
go to Network and Internet and open Internet Option.
open general and look at the browser history section.
click delete browsing history on exit.
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.