Ten of the best free online antivirus sites

A few days ago, a friend's QQ was stolen, very depressed and I said that the anti-virus software I recommended to him was too bad, did not find the virus, resulting in the theft of QQ. He finally installed the network recognized the most powerful anti-virus software Cabas, scanning results of course did not, so very helpless to say that the virus Trojan is too strong. I do not want to say anything about this issue, I believe that people who know anti-virus software should know that the anti-virus software is perfect without use, each has its own advantages and disadvantages, because of the identification of the virus and the way of killing. In order to avoid the virus omission of the anti-virus software on the computer sometimes, it is not advisable to choose to install multiple anti-virus software.