Connection to Internet Problems

I've recently set up a Linksys Wireless-G router in my home and enabled a WEP security code for it. The problem is that I have a Dell Latitude D400 laptop that shows I'm connected with a strong signal (icon in lower right bar) to my router.

When I click on my browser to go to my home page though it gives me the standard "page not found".

1) My daughter can connect with her HP laptop to this router, so I assume the router is not the problem

2) My laptop works on other wireless systems, so I know it's capable.

I've went thru all the procedures on the "internet Options" page to repair, etc. but it's still not working. Any ideas what the hangup is??