What if the bad guys found ways to infiltrate your computer through the very antivirus software that you thought was protecting you? Recent discoveries suggest that this scenario isn't so far-fetched.

If you have the latest antivirus definitions, aren't you protected? Not necessarily. Most programs have an automatic update feature that's turned on by default, but the tool may update only the definitions, not other software modules such as the scanning engine.

By Stuart J. Johnston at Computerworld.

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