Don't know if I've posted in the right place???

Hi All,
This is a problem my brother is having;information as given to me by him
Dell inspiron 930 laptop,xp
has just switched to wireless broadband.BT home hub AFC6, Intel Pro Wireless 2200BG
problem; When I switch on pc, internet connection is lost,try to open browser bt broadband help kicks in with problem do I want to fix it? I click yes.

Problem is; "Your computer is not configured to automatically detect IP address,DHCP is not enabled to detect setting.gives 3 device options so click on Wireless to reconfigure. This happens every time I switch on computer which is a real pain. Anyone know how to fix this?
Thanks in advance