I've been thinking about the Sasser worm, which sneaks into your system and at a minimum ruins the machine's performance—if you have any left by now, since the patch to stop the worm also ruins the performance. Such worms are the worst, since they literally "worm" around the Internet looking for open ports on any machine connected to the Net. Certain ports have weird vulnerabilities, for reasons only Microsoft can understand. A worm jumps into the port, then executes itself inside the OS, which seems eager to oblige. Next thing you know, your machine is screwed up.
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