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Oops, I forgot the "install" part. (I don't use apt-get since I use RedHat-flavored distributions that use a different package manager.) How about "apt-get install clamav"?
"Are you root?" means that you're trying to run an administrator-only program (like apt-get) with ordinary user rights. By default, Knoppix boots up with you as the "knoppix" user. But you can become the "root" (administrative) user by typing "su" at a console prompt. There's no root password as I recall. You'll notice that your prompt changes from "$" to "#" when you're root.
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