Another vote for AVG and Avast here. Norton and Mcafee are just crap. I had Norton free on a laptop once and it completely fucked up my wireless connection even after I had uninstalled it! I believe something got left behind when I removed it.
It really pains me when I see someone in a shop buying Norton for like £50.
It really pains me when I see someone in a shop buying Norton for like £50.

















