There's really no need to go over this because it's been discussed many, many times on these forums and others. (Do a search on our forums and read the various opinions of others. In addition, there are reviews on Google which will give you their opinon.. There is a post at the top of this forum with which you can try a number of free antivirus tools..

Since they're free, try them all.. When you find the one that you like best, you have your answer.

Hope this helps.

Grif