Well if you didn't format it yet.. or did and still not working.
Some things that are easly missed:
- Windows firewall, or any firewall for that matter...
Sometimes it put the routers on the blocklist, so that you can't access it root page.
If thats not the case. What you can do is.
Look at the Router's manual and find how to Hardware reset the Router.
Usualy you have a 'Reset' button on the back, that you have press and hold for about 10seconds.
Reconfigure the Router, connecting a wire to the computer.
When it works with a Wire, configure the Wireless back.
Optional: Set up a WEP encription and disable SSID broadcast.
Also the D-Link DGL-4300 has a firmware upgrade, check it to make sure its on the lastest is v1.8
Do not try to update it by wireless.. use the wired connection.
If you managed to do all this everything should be working by now.. if not.. its something with the computer, go ahead with the format
"Chile is a thin and tall country"