More than 1 million computers - possibly yours, too - are used by hackers as remote-controlled robots to crash online systems, accept spam and steal users' personal information.... The government has no way to track down all the computers, both in the U.S.

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At first, they seem like your average junk email, containing share tips or an advertisement for Viagra, along with a small, slightly garbled picture. But this, experts say, is the spam that could bring the internet to a virtual standstill this year.

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