Added second laptop to home network and first laptop connection GONE

Help! I have a WRT54G2 v1.5 wireless-G broadban router set up on my hard-wired computer (XP) and had my new Sony Vaio laptop (Windows 7) connected wirelessly. Everything worked great! Then, yesterday, I added a Dell laptop to the network and my Sony got kicked off the network. I have tried to "add a device" but when I click on the link to do that from Network Magic, I get an error page on the Internet. I saw that someone else had a connection problem so I read the answer posted to their question and clicked on the link and again, get an Internet error. I am connected to the Internet: I checked! What is going on? I need the Dell laptop on the network as it is my new laptop for my job. Help! 

Let mw know the model number of router …also tell me the Operating system on laptop.

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