Hotfix rollup 2966779 is available for the .NET Framework 3.5.1 on Windows 7 SP1 or Windows Server 2008 R2 SP1

Hotfix Information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft website:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

To apply this hotfix, you must have the .NET Framework 3.5.1 installed. 

Restart requirement

You have to restart the computer after you apply this hotfix if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this hotfix.

Hotfix replacement information

This hotfix package does not replace a previously released hotfix package.

Issue 1

Assume that you run a Microsoft .NET Framework 2.0 Service Pack 2 (SP2)-based application or a Microsoft .NET Framework 3.5.1-based application to obtain the new currency symbol for the Russian Ruble. If the user locale for the computer is set to a non-Russian locale, the new Russian Ruble symbol is not displayed.

Issue 2

When you update the effected system to Visual Studio 2012 Update 2 on a .NET Framework 3.5.1-based application, you receive the following error message:
This issue occurs because an assembly is not validated by the Assembly Loader. This is because some assembly dependencies cannot be validated correctly by some policies that resolve dependencies in the .NET Framework.

Issue 3

You encounter high CPU usage when you run a .NET Framework 3.5.1 or Microsoft SharePoint 2010-based application on servers that contain more than 16 processors and the processor load cannot be attributed to application workload. 

The .NET Framework 3.5.1 was not optimized for large multiprocessor servers. The following environment variable may reduce some CPU load. However, we recommend that you do not apply these settings until the application performance characteristics are fully understood and until all application workloads are fully accounted for.