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A CD will have been shipped with virus signatures at the time of its production. Your virus may be a later made virus and thus the disk, and the program on it, won't know of this particular virus until a update is applied.

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12y ago
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15y ago

Because there are probably updates that are not included on the installation disk, so there will be viruses, etc. that will not be detected.

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15y ago

The AV software won't have the latest updates and will need these updates downloaded from the internet before it will catch new viruses.

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