If your own computer is infected with a virus which is protecting against you out of downloading security updates coming from the Internet or even from functioning any antivirus software on that machine? Or even searching for an antivirus software that can easily be moved in a USB disk drive so that you can quickly diagnostic scan any kind of disconnected computer intended for viruses or malware?

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http://softechnogeek.blogspot.com/2011/11/whole-new-lightweight-best-antivirus.html