no signal on speedstream 1024 adapter

Hi, I recently bought one Dlink wireless router (DI 524) and its working fine. i have two comuters installed speedstrem 1024 adapter, one is working fine and im not getting no signal on other one (same adapter). I tried many things its says "windows cannot configure" . i have a realtech LAN adapter (onbard) and a 1394. im totally confused with these.
kindly help
 
Usually you get the "cannot configure" message when you install some special wireless software. Did the WiFi thing come with some fancy program?
 
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