Uninstall the game. Only way to save your system from FnF4Ever.
Anything else that would tangate the game itself would require a massive overhaul which is more akin to a complete redesign rather than improvements. Imho, FnF4Ever can't be saved and shouldn't be. Throw it into the abyss and make something else instead, a real CnC, not this Arena sceleton with that asspull excuse of a story slapped to it.