Download Security Update for Microsoft .NET Framework 3.5 Service Pack 1 on Windows XP, Windows Server 2003, Windows Vista, and Windows Server 2008 from Official Microsoft Download Center

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Security Update for Microsoft .NET Framework 3.5 Service Pack 1 on Windows XP, Windows Server 2003, Windows Vista, and Windows Server 2008

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