Have you tried shutting down your computer, then turning off your router and DSL modem, wait about 10 minutes, then power on the equipment making sure all lights on the modem and router are displaying the correct lights, then turn your computer back on.
Don't try to connect immediately, be patient and wait until the OS fully loads all items in the tray area, then put your cursor up to the light in the tray and see what is says, local, or local and Internet.
If it still say limited, try pinging a website