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Seems like every major piece of Dimdows software has to provide its own
proprietary update mechanism. Each one needs to access the Internet under
its own terms. Pretty soon you have all these different components making
network connections, and you have no idea what might be happening on your
machine.

Like when the bad guys step in and hijack one or more of these to their own
ends
<http://www.h-online.com/security/news/item/Security-problems-in-Adobe-s-Download-Manager-935642.html>.