I have completely reinstalled FSX on my system but am having problems reinstalling the B737.

I have downloaded the latest model
I have uninstalled my previous version
I have deleted the HKEY registry

When I run the installer I am not prompted for my order number.  Although the product installs I am left with black gauges in the VC, and the 2D panels (e.g. simicons) do not appear.

What am I doing wrong?

Thanks in advance

Karl