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W32.Braid, also known as PE.Brid, can spread to PCs running any version of Microsoft Windows. People who use Microsoft Internet Explorer 5.01 and 5.5 may find that their computers automatically become infected, because Braid uses an old flaw in Internet Explorer to automatically execute the attachment that carries it when the e-mail message is viewed. Patching the program with Service Pack 2 will solve the problem, Network Associates said in its advisory on the virus.