AP extreme AP Express to extend ...

So I bought the AP Extreme to have a much faster and RELIABLE network compared to my old .b network. Well, due to walls, interference, I tried to give AP express a try and extend my network. The problem is it is "hit and miss" to force the wireless clients to attach itself to the AP express. Is there a reliable way to auto-force upon reboot of the machine and my Squeezebox, to the AP Express??? The only way I have been successful is a full shutdown of both my routers, then my devices, and rebooting the AP Extreme first, Express 2nd and then rebooting my machines, and sometimes that does not even work.

Any ideas?????

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Orignal From: AP extreme AP Express to extend ...