Are you able to see available network with your laptop? Try this: open CMD prompt and type ipconfig/all and hit enter. See if detects the wireless card and also it is getting a IP address.
If no, make sure if the drivers are properly installed. right click on My Computer, select Properties, Device Manager. Make sure there is no X or ! sign next to the Wireless network adapter line.
If laptop can see available network, you can try to change the router setup. Temporary turn off the wireless encrpytion. Try to connect. If works, put the encrpytion back (WAP2 preferred) and the password/passphrase (case sensitive). Also make sure that when testing, MAC filtering is not enabled. You can enable it or not when putting encryption back.