What is the best Anti-virus for my PC?

I am using AVAST from logtime, I have used AVG, KESPER SKY and MCAFEE but from All these I love AVAST because it updates itself everyday in 5 seconds, no problem of Computer Slowdown and It protect us from EMAIL virus, Online Doubtfull sites,and network attack. but disadvantage with my avast is it is not able to repair any file is corrpted & there is no way for repair then you have to delete it always. MCAFEE IS BETTER IF YOUR SYSTEM WITH HIGHER CONFIGURATION.