Setting up a wireless router with a Windows client can be complicated. There are a number of measures and options that have to be understood, and it's all too easy to make a mistakes--but D-Link provides an easy-to-walk-through configuration system to help you set up your D-Link wireless router.
Plug one end of the Ethernet cable into the DSL modem.
Then plug the other end into the "WAN" port on the back of the D-Link wireless router.
Connect wired computers to any of the other Ethernet ports on the router using another Ethernet cable.
Open your web interface and type
"http://192.168.0.1" into the address bar, then hit "Enter" or "Return."
Use "Admin" as the username and leave the password blank when the login screen appears.
Click "OK." You should now see the D-Link configuration screen.
Change your administrative password by clicking on the "Tools" tab and choosing the "Admin" button. Enter a new password under the "Administrator" heading. Confirm it, and click "Apply."
Disable the wireless Local Area Network (LAN) if you don't need to use the wireless access and you want to make sure no one else is able to access your network.
Under the "Home" tab, choose "Wireless" and select the "Off" option.
Locate the "Home" tab in the D-Link Configuration screen, and click on the "Wireless" button.
Use the "Open System" button beside "Authentication."
Select the "Enabled" button next to "WEP," and set the encryption key to "128 bit."
Set the "Key Type" to "ASCII" and choose a 13-digit password for the "Key 1" field.
Write down the password in a secure location.
Change the SSID to make it more difficult for others to locate and use your network by clicking on the "Home" tab and locating the "Wireless" button.
Change the default SSID to one of your choosing, then click "Apply."
Disable SSID broadcasting. Under the "Advanced" tab, click on "Performance" and check off the "Disabled" box. Again, click "Apply."
Click the "Advanced" tab in the D-Link "Configuration" screen and select the "Filters" button.
Choose the "MAC Filters" and click on "Only Allow Computers with MAC Address Listed Below to Connect to the Network."
Enter the name and MAC address of the computers allowed to access the network, beginning with the one you are currently configuring. Click "Apply."
Allowing access to the computers you choose based on the MAC address is good security, but it's difficult to manage on large networks.