Make sure the LAN cable from the computer you are using is plugged into the router one of the router LAN ports, not the single WAN port. Have nothing else plugged into the router. Turn both the router and your computer off then power up the router first, wait for it to intialize, then power up the computer. Try to access the router using the computers browser with one of the two default router access address's, either dlinkrouter or 192.168.0.1.
If you get the router screen up the default username is admin and the default password is blank ie empty. You can then configure your routers LAN settings and then plug in your WAN cable from your modem and configure the routers WAN access data. If this doesn't work, try another LAN cable from your computer to the router.
Hope this helps.