Download Security Update for Windows Media Encoder 9 Series for Windows XP SP2 x64 Edition and Windows Server 2003 SP2 x64 Edition (KB2447961) from Official Microsoft Download Center

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Security Update for Windows Media Encoder 9 Series for Windows XP SP2 x64 Edition and Windows Server 2003 SP2 x64 Edition (KB2447961)

A security issue has been identified that could allow an unauthenticated remote attacker to compromise your system and gain control over it.