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The 20 Worst Windows Features of All Time

From Windows 95's Active Desktop to Vista's UAC, a loving tribute to the tools, technologies, and applets that drive us absolutely bonkers.

5. Messenger Service 17 of 21

Just perusing the article in Microsoft's knowledge base about this alert service (no relation to the Windows Messenger IM client)is enough to make you shudder: "If advertisements are opening on your computer in a window titled Messenger Service, it may indicate that your system is not secure...some advertisers have started using this service to send information via the Internet, and these messages could be used maliciously to distribute a virus." Windows XP SP2 disabled it by default; Vista eliminated it. Good riddance.

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