10. Defense against Adware and Spyware If you are noticing a lot of pop-ups, or if your computer is suddenly running very slow, you can download a free program called Ad-Aware for at http://www.lavasoftusa.com/ This program scans your system for hiding places where these advertising companies save their programs. Like the anti-virus software, this program must also be updated before you scan with it each time. This will ensure that you are getting the most recently developed protection.