Download Hotfix for Microsoft .NET Framework 3.5.1 on Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1 from Official Microsoft Download Center

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Hotfix for Microsoft .NET Framework 3.5.1 on Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1

Install this Hotfix to resolve the issue described in the Knowledge Base Article linked below.