Xbox 360 Live Help!?

Right, I have heard instead of plugging your ethernet cable into your router you can plug it into your laptop which has a wireless internet connection. On the official Xbox website it tells you how to do this: http://www.xbox.com/en-US/live/connect/ics_xp.htm# but when i get to step 3 I get this error


';An error occured while internet connection sharing was being enable


Internet connection sharing cannot be enable


A LAN connection is already configured with the IP address that is required for automatic IP addressing';





Please help and is your xbox live connected to a laptop connected to wireless internetXbox 360 Live Help!?
You need to put in a WEP key