This is widely documented throughout the internet already, yet it still took me hours to get sorted so I thought I would share a few tips.

In my case I could not add .Net 3.5 from Add/Remote features within Windows itself, this failed.

The next step was to try using Dism.exe commands which also failed (This does work, I will explain why it did not work for me)

With my Installation I installed Windows 8 and then proceeded to run the upgrade to 8.1 from the Windows Store.

The installation of .Net 3.5 for Windows 8 & 8.1 are DIFFERENT which is not widely documented.

If you upgrade to 8.1 then you need to enable this feature with Dism.exe from a Windows 8.1 disc, your version 8 disc will not work.
Here is the code to do this: Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:E:\sources\sxs /LimitAccess

This is where E:\ is your CD Drive.

 

This code is the same for Windows 8 but you need to use a Windows 8 disc not 8.1

Alternatively I will post links to both the Windows 8 & Windows 8.1 .Net standalone installer, I used these to get .Net installed correctly.

Windows8 32/64bit .Net 3.5 Standalone: http://bit.ly/1h9lSi9

Windows8.1 32/64bit .Net 3.5 Standalone:http://bit.ly/1bEiBto

Thanks to My Digital life forum for the 8.1 Link (http://bit.ly/18VzL3i)

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