Win 8\Win Server 2012: Error when installing .NET Framework 3.5

.NET Framework 3.5 – “Error while enabling Windows feature: NetFx3,”

.net framework

The Error while installing SQL Server

I’ve seen this error occur in 3 places:
When enabling the .NET Framework 3.5 via Programs and Features -> Turn Windows Features on and off.
During the installation of MS SQL Server.
During the installation of MS Dynamics SL.

The solution to this is to manually enable the .NET Framework 3.5 using an elevated Command Prompt.

Here are the steps:
1. Insert the windows installer media – either the CD/DVD or as a mounted drive from an .iso file.
Note the drive letter as this will be needed in the last step.
2. From the start charms, right-click on the command prompt application then select ‘Run as Administrator’.
3. Type cd.. in the command prompt window.  Repeat until you arrive at just a drive letter prompt
(Examples: C:\>, E:\>, etc…)
4. Finally type…
dism /online /enable-feature /featurename:NetFx3 /all /source:E:\sources\sxs /Limit Access
Then press enter.

netfx3

If this completes successfully, you should now be able to install SQL Server and/or Dynamics SL without receiving the original error.

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