Best Antivirus Software

When it comes to secure system/PC from the Virus, Trojan, Malware, etc., which ever not acceptable to PC health, I have seen many people using their Brain more than the system resources. I mean to say, they either go for installing more than 1 antivirus or install so many fake antivirus tools that affects PC very badly. The result of this the slowing down of system.

So, which is the best Anti-virus in queue of so many Anti-virus ?

Who or Which company is providing the rating of Anti-Virus Software ?

Above two questions are quite useful while protecting the PC from wrong things.

Lets start with Who/Which company is providing the Rating -

Its “AV-comparatives“which is providing the rating, who are AV-comparatives ? – ” AV-Comparatives is an Austrian Non-Profit-Organization, which is providing independent Anti-Virus software tests free to the public.”
This month they tested these Anti-Virus softwares :
avast! Professional Edition 4.8
AVG Anti-Virus 8.5
AVIRA AntiVir Premium 9
BitDefender Antivirus 2010
eScan Anti-Virus 10
ESET NOD32 Anti-Virus 4.0
F-Secure Anti-Virus 2010
G DATA AntiVirus 2010
Kaspersky Anti-Virus 2010
Kingsoft Antivirus 2009
McAfee VirusScan Plus 2009
Microsoft Microsoft Security Essentials
Norman Antivirus & Anti-Spyware 7.10
Sophos Anti-Virus 7.6
Symantec Norton Anti-Virus 2010
TrustPort Antivirus 2009