that is how I did it with my Linksys.
The Linksys program requires that you have PPPoe set up with the DSL modem, and then hook the Linksys up to it so it can read the settings from the XP PPPoe connection. Only problem is that if you choose not to use PPPoe and use direct Internet instead, XP ghosts out the PPPoe option and never lets you select it again! The XP PPPoe clobbers the Linksys PPPoe when both are active and on the same router.
SBC software is Spyware, slows down the system a lot as well. Linksys software is not required. The only reason why you would need SBC software is to use the Enternet 500 PPPoe driver for Windows 2000 and lower that do not have a built in PPPoe Driver like XP and above has. Also you need the SBC software to create an account before you can even set up PPPoe, after that you can remove it. In case you do not want to use the SBC software to create an account, you can phone the helpdesk and request that they create an account for you.