Download .NET Framework 1.1 Service Pack 1 CLR Security Update for Windows 2000, Windows XP, Windows 2003 Server x64/IA64 and Windows 2003 Server R2 x64/IA64, Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2 from Official Microsoft Download Center

.NET Framework 1.1 Service Pack 1 CLR Security Update for Windows 2000, Windows XP, Windows 2003 Server x64/IA64 and Windows 2003 Server R2 x64/IA64, Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2

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A security issue has been identified that could allow an attacker to compromise your Windows-based system with the Microsoft .NET Framework 1.1 Service Pack 1.