Problem with connection between asus wl 500g deluxe access point and wl-138g cards

dear sirs,

I made at home a wireless connection between various laptops and an access point from asus named wl500g deluxe. Everything works fine. There are 3 laptops which are absolutely ok. The only problem I have is that I can not do the internal network. The laptops can not see eachother. And i tried to connect some desktops with this wireless network, but WL-138G (wireless network cards) can not connect. It can't connect to the network (no IP and gateway is provided). The access point is set to AP DHTP server. nu manual IP is assigned from access point.... how can I set LAN? And how can I connect those desktops? thnks.....