Best Anti-Virus?

My Norton anti-virus that came with the purchase of my laptop is due to expire in a week. I would be very appreciative of any advice and or warnings people might have for a replacement anti-virus program. I know there are free programs to be found online, but am not too tech savvy and am unsure if this is the best route to take. Free is appealing as I am on a budget, but I know how costly viruses can be from past experiences, so don`t want to save now only to pay more in the long run. Does anyone have any suggestions for a decent program? I am also never certain if programs are comprehensive, or if there are additional safety measures I should add.
Again, I would be very grateful for any input. Thanks in advance!