The integrated wireless adapter

I tried to connect to the Acess point, trendnet TEW 431BRP, using the
integrated wireless adapter in 3 computers, Acer Centrino, HP Compaq nx9030,
and Sony Vaio VGN SF215Z. No one worked.
I use windows XP configureation. BUT, when I installed a USB 2.0 wireless
adapter, the 3 of them could be connected.
I activated the integrated adapters, I added manually a wireless connection
for the integrated adapters using the configuration of the Access point, but
no result.
Can any one please tell me why all theses integrated wireless adapters do
not work.
Thank you in advance.
R. BAKIR