Download Security Update for Windows Server 2003 64 Bit Edition and Windows XP 64 Bit Edition Version 2003 (KB839643) from Official Microsoft Download Center

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Security Update for Windows Server 2003 64 Bit Edition and Windows XP 64 Bit Edition Version 2003 (KB839643)

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A security issue has been identified that could allow an attacker to cause DirectX, or applications using DirectX, to become unresponsive.