Antivirus and your computer

One of the most important application on everyone's computer. Sometimes antivirus is suck. Some antivirus can make your computer become slower because it use a lot of memory. Some of them are like a rubbish. They dont detect any virus entering your computer and some of them detect the virus after your system has been infected by the virus , worm or trojan. I used karpesky before and for me KAV is not a good protection for ur computer. There are lotsa free antivirus u can get nowadays such as Avast , AVG and Avira. Right now i'm using free version of Avira, frequently update and of course it is free. In my experience Avira is better than KAV. Thanks avira for give me free version.