ICS problem with wireless connection

I am using a wireless Dlink DI624 router connected with a wlreless DWL-G520
wirless card. On another desktop, I am using another Dlink DWL-G520 wireless
card. I am also using a laptop with wi-fi and a PDA with wi-fi. I am not
having any problems recognizing these on the connected desktop. However, I
cannot access the Internet with any of the wireless devices. I had a set up
exactally like this before and all connected to the Internet. Nothing now.
I am using a dial-up and not broadband. The modem is set to share Internet
Connection and all others are not. What have I done wrong? By the way, when
I boot up, I get an error message that states in part. "IPX/SPX or compatible
CP reported error 733". What does this mean and how can I fix it. I would
appreciate any and all help.
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Thanks, Charlie