I have a embarq 660 series router and using a compaq presario computer. I have already installed the belkin surf/share wireless USB adapter to this laptop. When I go to Internet explorer it says offline.

Your problem is a IP address conflict

Embarq and Belkin have the same IP address 192.168.2.1

change the IP address in to your Router.

To restore the router to factory default settings, please do the following:
1. Unplug the router's power supply
2. Press and hold the reset button on the bottom of the router
3. Keep the reset button depressed and, at the same time, plug the power supply back in
4. Keep the reset button depressed for another 10 seconds
5. Release the reset button
======================= Manually configuration ==============================

Step 1 : Connect modem - Router - Computer ( Wired )
Step 2 : Open router setup by typing http://192.168.2.1 on the address bar of internet explorer
Step 3 : On the left side under internet WAN click Connection Type
Step 4 : leave the Password Blank and click submit
Step 5 : Choose the connection type as dynamic and click next

Now go to lan settings and change the IP address 192.168.2.1 in to 192.168.1.2

Step 6 : Leave the Host name blank and click apply
Step 7 : On the left Under Internet WAN Click MAC Address
Step 8 : Click Clone and Click Apply changes
Step 9 : If the Internet status on the top right is connected
Step 10 : Then check if you have internet
Step 11 : if not Then unplug the Power Cable from the Modem And the Router
Step 12 : Plug the power Cord to the Modem
Step 13 : Wait till all the lights are on
Step 14 : Plug the power to the belkin
Step 15 : Check the color of the light in the belkin
Step 16 :If green then Check if you have internet
If not working then call belkin
=================== WIRELESS SETTING UP A WIRELESS CONNECTION ====================
Step 1 : Connect Router - Computer ( Wired)
Step 2 : Open Router Setup by typing http://192.168.2.1 on the address bar of internet explorer
Step 3 : On the left under wireless click wi - fi protected setup
Step 4 : Leave the password blank and click on submit
Step 5 : Disable it and Click on apply changes
Step 6 : On the left under wireless click Security
Step 7 : Enable 64 Bit WEP
Step 8 : Type a 10 digit number on the key 1 ( 2 in each box )
Step 9 : Click apply changes
Step 10 : on the left under wireless click channel and SSID
Step 11 :Change the Wireless channel to 6
Step 12 : Change the SSID to a different name ( no Spaces )
Step 13 : Click apply changes
Step 14 : Now Scan and connect to this network ( Wireless )
Let me know if it works