Dell Dimension C521 computer with an Ethernet Wireless Adapter won’t let me connect to our new ISP.

My router is a Linksys WRT54G, and it previously worked with Vonage. I already tried some steps.

My ipconfig/all said I was using Broadband, but my Mom’s computer running off the same router was set to Hybrid, so I changed the registry for Hybrid on mine. Then it said I didn’t have routing enabled, so I changed that in the registry as well. Now it’s continually pending connecting, then it times out.

It won’t let me enter the router setup through its I.P, but it does on my moms. It just acts like it can’t load the page because i’m not connected. Wondering what it could be. Help!