SAN FRANCISCO - The number of new viruses and worms aimed at Microsoft Corp.'s ubiquitous Windows operating system rose 400 percent between January and June from the same year-earlier period, leading computer security company Symantec said on Sunday. . . .
SAN FRANCISCO - The number of new viruses and worms aimed at Microsoft Corp.'s ubiquitous Windows operating system rose 400 percent between January and June from the same year-earlier period, leading computer security company Symantec said on Sunday.

Nearly 5,000 new Windows viruses and worms were documented in the first half of the year, up from about 1,000 in the year-earlier period, said Symantec, the world's largest computer security company by revenue.

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