Wireless Network Connection in Windows XP Without a Roouter

Hello guys,
i need help. i want to connect my laptop
(VAIO VGN-FS415 - INTEL PRO/Wireless 2200bg Network Connector 802.11b/g
) with my destop pc (ad hoc wireless network)
(AMD64 3200 - Wireless Pci D-Link 802.11G DWL-G520)
.. I have configure booth machines like the instructions that i find there
because i don't have a router or access point.

http://www.microsoft.com/windowsxp/u...02april08.mspx

Both machines recognized my wireless network, are connected with excellent
signal,speed 11mb/sec, the desctop pc sending package and not receive and my
laptop do not receive or sending anything and i can't map network drives.
Firewalls in booth machines are disabled.
As i said i don't want to buy router or access point now but i don't know
why i can't connect my pc's.
Thank you for any help.
Christos