The most popular target for viruses, worms and Trojans is Windows itself. It might sound like an extremely basic step, but a large number of people turn updates off to mask pirated copies of Windows, and risk their computers' security in the process. Even if a user can't see any sign of a malware infection, their PC might have become part of the hundreds of zombie networks that are active and flourishing around the world. Such PCs are slower and less stable because of additional background processes that perform the botnets' dirty work, but more importantly, they also contribute to the spread of such malware to millions of other users around the world, and send out thousands of spam messages every day.

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To make sure your computer does not catch an infection and turn into a zombie, you should always be using a non-pirated copy of the OS, and activate the automatic system updates feature. Only this way can you be sure that your computer is as up to date as possible with patches for security loopholes. You can find the required settings at 'Start I Control Panel I Security Center I Activate Automatic Updates'.