If you have set your router up with encryption, say 128-bit WEP, you will have entered a pass phrase which will have generated 13 hex digit pairs which should be viewable and save changes.
You must note these down.

Return to your laptop, Control Panel>Wireless Networks>R/Click Wireless Connection>Properties>Wireless Networks>Preferred Network>Highlight yours>Properties>Data Encryption>Enter those noted numbers/letters>Confirm>OK

Try that and see if you can connect.

Look at this link (Belkin Setup) . . . . > Router Setup . It may help a little if your using Belkin equipment and software.