You can't beat Avast, no matter what anyone says. I've used it for three years on four different systems, three laptops and this new PC that I'm using. Most antivirus programs slows the system noticeably, while Avast doesn't. And you have realtime protection. But it is a must to set the program to auto update. You'll know that it is updating, because it actually tells you so in audio. Add Ad Aware for a complete 1-2 punch against all malware, adware, spyware, tracking cookies and much more. The best thing about it is that both programs are free. And you get no "nag screens" trying to get you to make a purchase. But keep in mind that the free versions are for personal use only. They both have paid versions for business or professional purposes. You can't go wrong with this kind of protection.
