Re: You are subscribed to this thread Compaq Presario Won't Connect to Router
Do you have the latest / correct drivers for your wireless card? Have you confirmed that your security password/passphrase is correct? Are you using the correct security setting (WEP, WPA, WPA2 ?). Does your router issue DHCP? If so, is your wireless card set to obtain IP automatically, or does it have a static IP configured? If it does have a static IP configured, I'd be willing to bet it's not within the router's IP range/subnet.
If the above has been confirmed, I'd then check to see if the router has settings in it where maybe it's been configured for MAC Filtering (where the router only allows machines with specific MAC addresses) or if DHCP only issues a limited amount of IP addresses (5 instead of 100 addresses).