I'm getting the same thing since I reinstalled FS on my new machine. All kinds of add-on related DLL's are either not allowing the perspective add-on to run or crashes FS9 altogether. The problem with this scenery is the DLL's placed in the modules folder. If you remove them FS9 loads up fine, put them back and FS9 crashes on startup. I can't imagine what would cause this. I installed FS9, installed the 9.1 patch, and proceeded to install my add-ons. Most higher end add-ons will not run because of a conflict with their various modules. FS9 treats them as if their outdated. I have the latest version of DirectX, XP SP2, and all updates installed. This is weird...
Maybe if I get this solved I'll figure out the rest...