I have used many antivirus. Ans what ever I used these had some kind of problem. Normally when we talk about an Antivirus the  fact that we think about is the performance of the system.  It is 100 % sure that most of the top selling Antivirus programs affect the system performance.  And atlast when we cannot work on the system due to the negative effect of the installed antivirus   software we uninstall it and go without antivirus. And this is the Good time  for Hackers, Virus, malware etc. And once it is affected by such a virus we are force to Format the system and reinstall everything from the very beginning.

I think I found a good Antivirus -  “Avast” , yes Avast is perfectly light weight program which will not give any strain on the the CPU or Memory. I recommend this  . You can download an evaluation copy or download the Full version.

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Avast AntiVirus	Avast AntiVirus