Ozzie,
If you added the drivers through the Ghost Boot Wizard, you will not have to repeat that step; once drivers are added to a build of WIndows PE, they are in there. And in this case, the only option is to recreate the boot USB drive, anyway. But please note that you
do not need to add the drivers an aditional time.
Alternately, after booting to your current boot USB drive, you could manually run the net use command. This is certainly less convenient, as the purpose of a boot package is to take care of this automatically.
Thank you,
Randy