I think SF needs to be started on driver level when windows boots up, even if the driver is set to demand, you have to reboot anyway to make them work. I messed around with them some time, some of them can't be started/stopped without a reboot....
IMOH It makes no difference to delete them, start FC and reboot.... or
to set them on demand, activate them, have to reboot anyway.
But I'm by far no expert on this...