The best bet I would think is to leave the computer off until the "Free Time" to avoid FAP. OP indicates a HN9000.
But that's the point of the registry fix: You don't have to turn off the computer, you just have to make BITS only operate in the "Free Time." -- Motosat self-pointing dishes: .74 meter G74 on 127W, SL-5 HD DirecTV|Hughes HN7000S|Verizon UMW190 Air Card|1990 Blue Bird Wanderlodge Bus "Blue Thunder"|Author of hnFAP-Alert, PC-OPI and DSSatTool
I agree Don, it sounded however that the OP was concerned with FAP and "mysterious usage". If the OP were to keep the computer off until the free time and then update that would get Him/Her past past FAP.
The poster didn't seem to have usage concerns with the old computer, so once fully updated the new one should be in the same usage pattern.
As for messing with the registry...that could get a little dicy depending on the experience level of the OP.