Windows 7: Internet Connectivity

I just bought a new laptop with Windows 7. I was trying to hook up a wireless router the computer. I followed the instructions, but there was an error so the wireless connection was never completed. Before I tried to set up the wireless router I connected straight to the modem with an Ethernet cord, now when I try to do that it states that I have little or no connectivity. Now I cannot connect through either the wireless router or the ethernet cord, how do I get the internet connection to work again using the Ethernet cord?

We need some information about your setup. can you tell us about your network
what router? what cable modem?, what wifi cards?

Did you update the driver?

ken

I have narrowed the problem down. I have a motorola cable modem from comcast and my wireless router is a netgear WGR614. I am having trouble connecting to the internet and I noticed my IP address is no longer valid. I tried to renew the ip address, but i keep getting an error stating that my media is disconnected. Is there anyway to solve this problem to get a new IP address?