90 degree edged shore textures HELP

Fior some reason my Alaskan shoreline textures are all 90 degree angles. There are even some square lakes now 
I think it happened when I removed a mesh I was not satisfied with. Is there a way to install just the terrain mesh from the FS9 discs to I can get it back to normal?

I think it happened when I removed a mesh I was not satisfied with. Is there a way to install just the terrain mesh from the FS9 discs to I can get it back to normal?