Problem joining network

The network I set up runs an airport express, a macbook, a dell xps and a (very old) toshiba laptop. The problem occurs when my macbook and dell try to connect to the network at the same time. When the dell wi-fi is enabled, my mac cannot access the internet at all (although signal strength is always at max), printing is stuck in 'connecting' mode. I have tried changing channels, playing around with the security settings, assigning static IP addresses and changing the operating mode of the express. Is it the settings on the dell that I should be changing around?
Any help on this topic would be appreciated!

I am using a Buffalo router as an access point - same configuration as you. My home office router is an Airport Extreme - it handles the DHCP. Works great for the other PCs and Mac's in the house. I use the Buffalo for B level network and Airport for N level.
Since my last update to the iPhone (current 2.1) my iphone would not accept the DHCP through the Buffalo router. Similar symptoms to yours. After reading a few posts, I setting>general>network - reset network. I also powered down and powered up the Buffalo router.
Now things seem to work. - Give those a try.
Strange

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    Message was edited by: sandraqu
    Message was edited by: sandraqu

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