hello! is it possible to revert to OOO only game after succesfully installing fcom or do i need to uninstall everything? i want to revrt back because my pc cant seem to handle the fcom set-up while it runs quite smoothly on OOO set-up. thanks

Should be fine. Go to a secluded cell, such as the player home, make a save, make the changes, load the save, wait 4 days for a respawn and make a new save. That should be it.