__link__ Download Windows6.1-kb958-488-v6001-x64.msu < 2K >

Or via PowerShell:

This update addresses a series of reliability and compatibility issues specifically for .NET Framework 3.5.1, which is installed by default on Windows 7 systems. It is particularly important for users running via Internet Information Services (IIS). Download Instructions Download Windows6.1-kb958-488-v6001-x64.msu