Sorry for the delay in replying to you.
This error can generally be resolved by running the repair function on the launcher. As this step was one of the steps recommended in the thread you linked could you please try downloading the latest launcher setup file (www.swtor.com/download) and running it over the current installation. After this please do a Clean Boot, then log in on the launcher and run teh repair option again.
If this does not resolve the issue please come back to us with your DxDiag.
In the final link of my original post I sifted through a lot of information provided by a technically minded poster on the forums and followed the exact steps you have provided that he advised, but it did not work.
As I mentioned above I've managed to resolve the issue by reinstalling my operating system so we are all good, thanks for getting back to me anyhow.