Plug your laptop or wireless device directly to the router using a network cord. If you still cannot access your router through a hard wire connection, unplug the router for 45 seconds and plug it back in. Then restart your computer while it's still hard wired to the router.

Your router IP address by default should be 192.168.1.1. In order to make sure you are on the same network, click on start > run and type cmd or open a command prompt by typing cmd into the search field under vista and windows 7. Once you have a dos window open, type IPCONFIG and make sure that your IP address is 192.168.1.x. x represents any number that would be leased to your computer from the router. If you do not have that a 192.168.1.x ip address, DHCP might be turned off on the router and you will have to set up a static IP address through networking and connections managment, or network properties in windows xp.

In order to do this go to your control panel and into the networking icon. Find your LAN connection and right click and then left click on properties. Once it's open, click on TCP/IP and then click on properties. Change the raido buttons from Automatically Obtain to Manual and for the IP address type the following:

IP Address: 192.168.1.100
Subnet Mask: 255.255.255.0
Default Gateway 192.168.1.1

Click OK twice and try and connect to your router through the default IP address of 192.168.1.1.

If you had to configure your IP manually, make sure you go back in there and change it back after you configure your router for DHCP.

Have a great day.