Ok.
Here's .NET in a cab. Throw this on your phone and install.
This is .NET config. Install and open then select device policy and select 3.5. Save. Exit.
Go to folder you installed TF3D Config into and delete tweaks.xml.
That should get you going.
Unless of course you have a new enough ROM on your device and .NET is up to date. In that case it's probably just the tweaks.xml thing.
Hope that helps.