[irish1958]

I have one suggestion:
Uninstall everything, clean your registry with a good registry cleaner (not ccleaner), purchase a copy of SH3, patched to 1.4b and starforce free, and reinstall in a folder outside of the program files.
In the future, do not use Steam if you want to modify a game in any way. They have made no effort to eliminate the modifying problems and offer no help when you have a problem.