problem with IP address

Hello can someone please help me ? My both of my computers were working fine until today I cannot get the Two computers to get a IP address I have a Linksys wireless router the one computer connected to the router by ethernet works fine and is able to get a IP address when I reset everything. But The other two computers see the router they just cant get a IP address.Does reinstalling the driver for the WRT54GL you think might help? Thats the only thing I can think of thats left to do. Any help would be Appreiciated. Thankyou P.s. the modem is Comcast motorola cable.

 

How are the offending computers hooked up to the router? Wired, wireless...

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I called Linksys Toll free 24 hour customer support about the two wireless computers not being able to get the IP address and They told me to turn on one of the wireless computers and goto my computer/properties. And then all of a sudden the computer connected to the internet. I have no clue why after four hours of trying to reset everything. Those damn Gremlins.