Verified Purchase(What is this?)
This review is from: Norton Internet Security 2013 - 3 Computers, 1 Year Subscription (PC) (DVD-ROM)
For a while I used free anti-virus programs (such as Avast, AVG, etc.) but after trying Norton when I got a free trial on a new laptop, I've bought each year it since.
It's pretty fast, and doesn't interrupt while you're using your computer. It automatically runs its scans when it detects the computer is idle, which means that just leaving your PC on while you go for a snack is enough for Norton to start a scan and it doesn't get in the way while you're trying to work.
As anti-virus goes, this is my recommendation.