The DOS command route -p add 207.46.0.0 mask 255.255.0.0 [192.168.0.254] (replace the address in brackets with a random address on your current subnet) will permanently route all would-be "phone home" packets to the random address that you specified.
Oh yeah an FYI... if you run ZoneAlarm or some other application level firewall, the executable file to that will be trying to call home is "WgaTray.exe"
Probably simpler to rename that file, or block it, if you don't want to route the packets.