Can't access internet wirelesly

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Greetings,

And appologies if this question has been asked a 1000 times before.

Running Win2kPro SP4 I can share my broadband connection no problem when
using CAT5 cable, a Compaq Netelligent 10/100TX PCI UTP Controller in my
desktop PC, and a Longshine Ethernet 10M in my laptop. The connection is
stable and DHCP works fine as does ICS.

As soon as I try to do the same using a Belkin Wireless PCI Network Card in
my desktop PC & Belkin Wireless G Notebook Netork Card in my laptop, the
whole thing goes tits up.

The laptop won't access the ICS DHCP server. Therefore no DNS or default
gateways are allocated either. If I use a static ip address of
192.168.0.254, subnet 255.255.255.0 with default gateway as 192.168.0.1 and
the same for DNS. The network side runs ok, but still no internet.

Pinging a hostname dosen't work so DNS is not working. Neither does entering
a tcp/ip address into IE6.

What the hell is going on. Is there a restriction in wireless networking
that means peer to peer ICS just won't work with out a router.

If this is so will an ordinary wireless router do the job with my Speed
Touch ADSL USB modem, or would i have to replace it with a modem-router.

Thanks in advance and best regards.

JohnP.