Norton, i guess. I dont use antivirus, its a waste of RAM for me. I never used it in years and have got no problems.
AVG as well, but in tandem with a few others like adaware, spybot etc. You can use a program called Hitman to run them all for you automatically instead of having to do it one at a time.
I have been using free anti virus before have encountered problems with. I have reformatted thrice already since viruses get inside without me knowing it and once in the system, I could not remove it. Now, I am using McAfee, its not free but I rather have it done have problems later on. My files are very important since I conduct lectures using my files.
I will not suggest AVG.. I have use it before..I infected by 'Ravmone' & they not detect it..Now I use nod32.. Give me better protection..
Ewww Norton?? No you didn't! If you DID use Norton, you would see it uses up A LOT of resources on your computer!
For me, it is kaspersky but we have Zone Alarm internet security on our company's computers and servers