Before you reset your router to the factory defaults, try this to make sure you are connecting to the correct IP address for your router:
1. With your computer connected to the router using a network cable, go to Start -> Run -> and enter cmd.
2. Enter ipconfig /all in the Command Prompt window that opened in step 1.
3. Find a section called Local Area Connection or something similar. The name could vary.
4. In that section, look for a listing called Default Gateway. It should have an IP address listed for it. Normally, it will be 192.168.0.1, 192.168.1.1, or 10.0.0.1, but it could be anything.
5. Substitute that IP address in the instructions you've been trying to run through.
One other thing to try:
InSSIDer is a free utility that will show you what wireless networks your computer can see and the signal strength for each of them.
You can download it from this site: inSSIDer Download Site