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At any moment, about 20 million of the estimated 1 billion Internet-connected PCs worldwide are infected with viruses that could give hackers full control, according to security software maker F-Secure Corp. Computers often get infected when people open e-mail attachments from unknown sources or visit a malicious Web page.
Pedophiles can tap viruses in several ways. The simplest is to force someone else's computer to surf child porn sites, collecting images along the way. Or a computer can be made into a warehouse for pictures and videos that can be viewed remotely when the PC is online.
