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wbryhn said:
I am having trouble editing files in the program files>paradox interactive>europa universalis rome>common

It refuses to allow me to edit these files.

copy the file to desktop, edit what you want and copy the changed file back to the original place. but make it sure, that you have a copy of the original-file. ;)

or: open your text-editor in administrator-modus.
 
BTW it's Vista preventing you, not the game. A permanent fix would be to uninstall the game and reinstall it outside the suggested path of c:\program files\... etc, instead choose c:\games\rome or whatever. And/or disable UAC in Vista.