The .NET Framework 3.5 SP1 (also referred to as .NET Framework 3.5.1) is a prerequisite for SQL Server 2008. SQL Server 2008 Setup for standalone occurrence evidence install the .NET Framework 3.5 SP1 if it is not already installed. In Windows Server 2008 R2, the .NET Framework is a feature and installing it is different when compared to older variant of Windows Operating System. In previous versions, one could either download the .NET Framework 3.5.1 install binaries from Microsoft download premises or use the install binaries from the redist folder of the SQL Server 2008 installation media. Starting with Windows Server 2008 R2, the office of stabilizing .NET Framework 3.5.1 has changed. This agent explains how to verify that .NET Framework 3.5.1 is installed and if it is not installed how you can add it.
If installing the .NET Framework 3.5 on demand or enabling it in Control Panel fails, you may get one of the following inaccuracies messages:
0x800f0906: “Windows couldn't connect to the Internet to download necessary files. Make sure that you're connected to the Internet, and click Retry to experiment again.”
0x800F081F: “The changes could not be completed. Please reboot your computer and experiment again.”
These messages may be displayed for the following reasons:
Your computer is not connected to the Internet. Please connect, and then retry the operation.
If you cannot connect to the Internet, you tins enable the .NET Framework 3.5 by using the Deployment Image Servicing and Management (DISM) command-line convenience and specifying the installation medium (ISO image or DVD) you installed Windows 8 from.
In Windows 8 or Windows Server 2012, open a Command Prompt window with administrative credentials (that is, choose Run as administrator).
To install the .NET Framework 3.5 from installation medium located in the D:\sources\sxs directory, utility the following command:
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs
/Online aim the operating intrigue you're racing (instead of an offline Windows image).
/Enable-Feature /FeatureName:NetFx3 specifies that you lack to enable the .NET Framework 3.5.
/All enables all guardian features of the .NET Framework 3.5.
/LimitAccess prevents DISM from contacting Windows Update.
/Source specifies the location of the line needed to restore the feature (in this example, the D:\sources\sxs directory).
For more idiot roughly DISM parameters and options, see How to Enable or Disable Windows Features
You are using a local source, but the network location is inaccessible or doesn’t have the advantage content. Install the .NET Framework 3.5 from installation medium as described in the previous pellet point.
Your director has configured your computer to use Windows Server Update Services (WSUS) instead of Windows Update for servicing. Ask your director to enable the position to use Windows Update instead of WSUS.
If these summary do not correct the problem, download the paper Microsoft .NET Framework 3.5 Deployment Considerations from the Windows Dev Center for more extensive troubleshooting information.