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The "Nimda" virus (or "worm") was an early example of a new type of threat to your computer. Until fairly recently, you were normally safe unless you blundered - for example by opening an infected email attachment. The latest crop of malicious programs can detect and infiltrate your computer when you're on-line, without you doing anything. You can read about the Nimda worm in one of these links:
If you want to read more about how sophisticated recent threats have become, here's an Example
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