In short:
Firstly, run a single copy of the client and make sure all your options are present and correct. Make sure 'start on windows boot' is NOT ticked, then exit the client.
Open a command prompt from the accessories menu.
cd \
cd program files
cd sb
then type:
sobsvc -i
sobsvc -o
Close the command prompt.
Then start menu, run:
services.msc
Scroll down to Seventeen or Bust Service, right click and 'start'
Check the number of SB processes you have running in the task list, there should be four.
Note: on these settings, the clients will be invisible - if you'd like to be able to see the clients in your tray, use sobsvc -k.
This all assumes you're using 2K or XP.