If the files are intact, the issue is likely a configuration conflict. The game may be stuck trying to force "Extra Quality" settings that your current hardware profile—or the game's engine—is rejecting.
"Extra quality" in the error code is somewhat misleading; it does not mean your graphics settings are too high. It simply means the game cannot find the data container required to render the map. Fixing the file path usually resolves the issue instantly. black ops 1 error execannotfindzone extra quality