I have had problems with Purity Scan(and others) that keep returnig over and over. It was originally downlaoded by my son, and he is no longer using my computer.I have a P.S. uninstaller on my computer and it will remove it for a few weeks, and then returns again.There will usually be another adware with it.This time it's "Zestyfind Desktop Links".What is this? I do not visit any of the sites that he did. Can anyone tell me how to remove these for good?