Can't connect to a certain network...

I got a brand new iMac this past week and a half.  It is so fast and beautiful.  BUT.  I'm trying to connect to my wireless Router, and I can't.  I get full bars saying I have connection, but I can't get onto the Internet.  I don't know why.  I know for a fact that it is a wireless router.  My computer is closer to the router, and I can't get it.  My moms computer is a room away and she can get it.  It says in my Network Preferences that it either has no IP- Address or it has a Self-Assigned IP Address.  I don't know what this means.  I'm typing this on another computer.  I hope this makes since.  I really do need help- I have to have a wireless internet connection before school starts...  

One of the problems with WEP is that the actual standard relies on a 10 character HEX key for 40bit WEP and a 26 character HEX key for 128bit WEP.
In order to make things easier, vendors use certain algorithms to convert simple alphanumeric passwords (or passphrases) into HEX keys, thus enabling the use of simple easy to remember WEP password rather than lengthy HEX keys. The problem is that different vendors use different algorithms to generate the HEX key and therefore a ASCII password on an AEBS will be hashed differently on a non-Apple client and vice versa.
See if the following Apple article will help: Joining an encrypted wireless network, especially the part about "For non-Apple wireless WEP networks".

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