(CNN) -- Computer criminals have found a new way to attack PC's with Windows operating systems -- that's about 90 percent of computers worldwide. For more than a week, hackers have been exploiting a flaw in a type of Windows graphics files, known as WMF, or Windows Meta File.

What's especially dangerous about the attacks: Your computer could be infected with viruses, spyware or other malicious programs just by viewing a Web page, an e-mail, or an Instant Message that has one of these contaminated images.

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NOTE: SurfBuddies WebMail filters messages containing these types of images (.WMF). Your children are safe from this new and dangerous attack.