Please Help ,Wireless client connection

Hi,

Help please, I trying to implement Wireless Lan Security with PEAP and
Passwords, I have setup everything by the book, like the paper from microsoft.
I have a wireless client that is working correctly (Windows XP SP2, Intel
2100a wireless card) the access point is a Dell 4350, this computer is able
to connect to the wireless network before the user LOGON, every thing OK on
the IAS server (computer authentication/User authentication).

Now the problem, I have 7 other computer trying to connect to the same Dell
AP but they only connect to the wireless Network after user Logon, before
user logon they try to establish connection using WEP ( I can see in log of
AP) but they shold connect using EAS, they only connect to AP after user
LOGON and using EAS. I have installed the latest driver for the wireless
adapters, re-applyed SP2 on XP, I tryed every thing I can remember. What cold
be the problem. Some of the client have the same configuration of the one
that is working others have Intel 2200BG and Dell truemobile USB 1300
wireless adapter.

Thank for any help
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Hello World !!