Malware and Badware are terms used to describe all sorts of software with malicious intent. Everything from 'root-kits' to trojans, viruses, and spyware. They do everything from hijack your computer to steal personal information.
The World Wide Web is 'checkered' with tricky, enticing, deceptive LINKS that we ALL stumble into from time to time. If you do not want to pay $75/hr to have a tech remove the infection, it would be prudent/frugal to do as much as you can to prevent it from happening in the first place.
Spyware is removed with spyware removal software. Scans are run manually or automatically according to a schedule. When spyware is found, it can be 'quarranteened' or removed altogether.
Based on several independent tests [incl. av-comparative and av-test] especially regarding real world protection and minimal system impact.
NOTE: Set scheduled scans for idle hours so that they do not slow your computer while you use it.
NOTE: Remove other/old Security Software BEFORE Installing New.