With 64 bit vista most anti virus software at the time only supported 32 bit although Avast actually did and used it for a while. I decided to look for something better and bought "Kaspersky Internet Security" from Tesco for £19.99 and I am so far very pleased with it. When I did the first scan it found a couple of problems that Avast ignored. If the choice was purely Avast or AVG then I would choose Avast.
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