Thanks Nick.

The only problem I have with Nvidia Inspector is that half the settings displayed in that image are not available in my version. The funny thing is that I have the 1.9.7.2 (from the link in the DX10 Notes.PDF file from the Avsim forum) and it STILL doesn't show the same listings/settings as the latest version.

At least I have the same available listings as your image, but not the same settings available. For example:

In your image, you have
Antialiasing - Mode     Application-controlled / Off

Whereas mine has
Antialiasing - Mode     AA_MODE_SELECTOR_APP_CONTROL (with the other choices being AA_MODE_SELECTOR_OVERRIDE and AA_MODE_SELECTOR_ENHANCED)

So I am left to guess as to exactly which one I should use (AA_MODE_SELECTOR_APP_CONTROL appears to be the right one).

Same applies to the Texture filtering - LOD Bias (DX)     -1.5000. Mine only has Texture filtering - LOD Bias     LODBIASADJUST_DEFAULT
Mine does not have  Texture filtering - LOD Bias (DX) or Texture filtering - LOD Bias (OGL) to choose from. So how am I supposed to get all those settings correct if mine differs so much? The funny thing is that this has ALWAYS been the case for me. When making the changes, half the settings do not exist in the Nvidia Inspector I am using, even though it is the same version as the one listed in the guide that I am following.

I guess my only option is to request a copy of someone else's FSX profile for Nvidia Inspector.

I added all of those lines that were missing from the guide (not added by the Fixer) into my fsx.cfg, and my frame rate dropped by about 5 fps! So now I am removing them and sticking with the changes made by the DX Scenery Fixer. :D ;D