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A 17-year old bug in Windows will be patched by Microsoft in its latest security update. The February update for Windows will close the loophole that involves the venerable DOS operating system.First appearing in Windows NT 3.1, the vulnerability has been carried over into almost every version of Windows that has appeared since. The monthly security update will also tackle a further 25 holes in Windows, five of which are rated as "critical".Home hijackThe ancient bug was discovered by Google security researcher Tavis Ormandy in January 2010 and involves a utility that allows newer versions of Windows to run programs that date from the DOS era. Mr Ormandy has found a way to exploit this utility in Windows XP, Windows Server 2003 and 2008 as well as Windows Vista and Windows 7.The patch for this vulnerability will appear in the February security update. Five of the vulnerabilities being patched at the same time allow attackers to effectively hijack a Windows PC and run their own programs on it. As well as fixing holes in many versions of Windows, the update also tackles bugs in Office XP, Office 2003 and Office 2004 for Apple Macintosh machines.