Problem: The Microsoft .NET Framework 3.5 (which is required for many applications) won’t install via ‘Programs and Features’, ‘Turn Windows Features on or Off’. You may get errors 0x800F0906, 0x800F081F, or 0x800F0907.
Solution:
I have experienced this on Windows 8.1, Windows 10 and Windows Server 2012. Microsoft have not managed to fix the issue with an update yet but have posted a workaround for it here https://support.microsoft.com/en-gb/help/2734782/net-framework-3-5-installation-error-0x800f0906–0x800f081f–0x800f09
To carry out this fix you will need an .iso of the version of Windows that you have installed. Then simply double click the .iso which will give mount the .iso as a drive (it will appear in explorer like a DVD).
Then open an elevated command prompt and run the below command:
Dism /online /enable-feature /featurename:NetFx3 /All /Source:F:\sources\sxs /LimitAccess
Substitute F: for the drive letter that the .iso has mounted as on your machine. The DISM tool should now successfully add the .NET Framework 3.5 to your machine.
