For those with a legit Windows install, now that AVG is crap boggy, Norton is the same crap it's always been. Get this for FREE from dear old Bill G :) easy to install, unobtrusive, and doesnt load the system
Help protect your PC with Microsoft Security Essentials
Microsoft Security Essentials is a new, free consumer anti-malware solution for your computer. It helps protect against viruses, spyware, and other malicious software. It's available as a no-cost download for Windows XP SP2 and higher, Windows Vista, and Windows 7.
Download Microsoft Security Essentials now.
Why should I download Microsoft Security Essentials?
Comprehensive protectionMicrosoft Security Essentials helps defend your computer against spyware, viruses, worms, Trojans, and other malicious software.
Easy to get, easy to useBecause Microsoft Security Essentials is available at no cost, there's no registration process that requires billing or personal information collection. It installs after a quick download and Genuine Windows validation and then stays automatically up-to-date with the latest protection technology and signature updates.
Quiet ProtectionMicrosoft Security Essentials doesn't get in your way. It runs quietly in the background and schedules a scan when your computer is most likely idle. You only see alerts when you need to take action.