Internet connects to laptop, not to desktop

Hello,
I have Linksys Wireless-G Broadband Router connected to my DSL Speedstream 4100 which directs the internet to my desktop while the laptop runs wireless. Yesterday the Local Area Connection status on my desktop says that I have Limited to No Connectivity whereas I was able to access the internet on my laptop.

I have tried unplugging the wires on both the modem and the router and resetting my router, but the connection fails on my desktop. When I finally unplugged the router from my modem, i was able to access the internet on my desktop, but now I have no connection on my laptop.

I was wondering if anyone is willing to state a solution so I can access the internet on my desktop and laptop when the router and modem are connected. Thank You!