Router Cancels Out Wireless And Host Computer Connections?

So yesterday i was sitting at my computer, doing nothing and then the internet shuts off. So i go up stairs to check on the router, and all of the normal lights are on, as well as the modem. Neither the host or wireless computer has internet.I'm able to be on the forums because i hooked my modem up to this computer, without the router.Whenever i set the router back up, it has the normal connectivity lights on, but the wireless computer AND host computet dont get connection. How to get my wireless computer back up through this router, without canceling ALL connection.[CODE]