Wireless Network Problems

My ISP had to be re-installed. I lost my wireleses network I had set up. I’m using Linksys WRTG54 router-I reset the router according to Linksys – I have internet on main computer no problem. I have a laptop that I used to connect to this wireless network. Now, it sees the network and logs onto it, but MIE does not connect – no browser. I use my Sierra network card to access wi-fi as well as my GSM. I connect to the GSM fine. It’s just my wireless network where I don’t have browsing capabilities on the laptop.