Windows Firewall

Hi, I have a problem with a wireless network. I have a desktop with Windows
XP Service Pack 2 and a Laptop with the same operating system. I have got a
wireless connection between the two, in Network places they both say
connected and excellent strength. When I try to connect to internet from my
Laptop nothing happens, I've tried running the home Network Wizard on both
with Internet Connection Sharing enabled. On the Laptop, Windows Firewall
keeps turning back on and the Home Network Wizard stops. I have tried to turn
the Windows Firewall off as I have my own firewall installed. It turns itself
back on, I've even tried deleting it off my computer but Windows XP wont let
me! I have lost my patience with Windows and need some help with this please?

Cheers for your help,