Step 1: Uninstall any of these updates in: Control Panel -> Uninstall a Program -> View Installed Updates.
KB2966826
KB2966827
KB2966828
Step 2: Then, retry installing the feature using the GUI (Server Manager), command line (dism), or PowerShell (Install-WindowsFeature)
Additional information on enabling features
Method 1: Using GUI - Server Manager
Method 2: Using Command Line - dism
dism : Using local installation media/Windows update/WSUS
DISM: With a local 'Alternate Source'
Please replace drive_letter with the drive letter of your local drive where the installation files reside
DISM: With a remote 'Alternate Source'
Please replace share_name with the the UNC of the shared location where the installation files reside
Method 3: Using PowerShell
PowerShell: Using local installation media/Windows update/WSUS
PowerShell: With a local 'Alternate Source'
Please replace drive_letter with the drive letter of your local drive where the installation files reside
PowerShell: With a remote 'Alternate Source'
Please replace share_name with the the UNC of the shared location where the installation files reside
Helpful Resources:
http://www.askvg.com/fix-0x800f0906-and-0x800f081f-error-messages-while-installing-net-framework-3-5-in-windows-8/
http://blogs.technet.com/b/askcore/archive/2012/05/14/windows-8-and-net-framework-3-5.aspx