Hello Margaret, as far as I know "Link Bucks" are not threats or viruses, they are just adware programs that causes annoying popups. These adware program gets installed on your PC without your knowledge when you try downloading some other trusted programs. These should be removed manually. I request you to start uninstalling all unknown/unnecessary programs installed on your PC and also remove all weird add ons, plugins, extensions, toolbars and search bars installed on your web browser. Please feel free to contact us incase you need any further help on this.