Download Security Update for Windows Server 2003 64-Bit Edition and Windows XP 64-Bit Edition Version 2003 (KB840315) from Official Microsoft Download Center

Security Update for Windows Server 2003 64-Bit Edition and Windows XP 64-Bit Edition Version 2003 (KB840315)

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A security issue has been identified that could allow an attacker to compromise a computer running Windows and gain control over it.