I was told to use AVG anit-virus by a guy at my local computer repair shop. I haven't had any problems with it, but on the other hand I don't think it has ever detected a virus on my computer. I don't know if there just isn't any or if the program doesn't find them! So should I change anti-virus software?

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I am a student at Oklahoma State University persuing a degree in Information Assurance and Forensics, As of now I would say that my knowledge level is a little below par, but am very anxious to learn as much as I can about all aspects of computers and networking.