Link

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