The 64-bit version of Windows 7 is the least likely version of Windows to be affected by malware, with 2.5 infections found per thousand PCs, and Windows XP SP2 the most likely, with 19.3 infections found per thousand PCs. However, since this shows 98 percent of XP SP2 PCs as uninfected, it’s not a good reason to panic. Oracle’s Java is the most common attack vector, ahead of HTML/Script (mainly malicious iFrames) and the operating system. The adware JS/Pornpop, which serves pop-under porn advertising pages, is now the most prevalent bit of malware.
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