Adding Windows 7 Features Post Unattended Installation

[forry]

I have got about 20 machines that were built last year using unattended installations of Windows 7.

In the unattend file I deselected the Product "Microsoft-Windows-NetFX3-OC-Package" in the package section because these machines did not need .Net installed.

Unfortunatly 12 months later, I now need .Net on these machines.

.Net does not appear in the standard add/remove features GUI, and DISM does not recognise NetFX3 as a feature either.

I am guessing this is because the Feature Package is missing because it wasnt installed.

Does anyone know of a way to add this product package to an existing Windows 7 installation?

At the moment, I am thinking that I am going to have to rebuild the machine.

Thanks

[maxXPsoft]

http://msdn.microsoft.com/en-us/netframework/cc378097 scroll down to NET Framework 3.5 Service Pack 1 (Full Package)

that may or may not do it. 3.51 was integral part of 7