I am having problems connecting my laptop to the internet on our desktop computer.  The laptop is a Dell XPS with Vista o/s.  It has an Intel Wireless WiFi Link 4965AGN card.  I am attempting to connect through a D-Link 2.4GHZ wireless router.  For some reason the laptop's card will not recognize the D-Link.  It was running fine yesterday but would not connect today.  I have another laptop that we are not have any problems with the connection.  It seems like we have had problems with this computer since the day we got it 14 months ago.  My daughter uses this at school and has not problems with the connections on their wireless network.  I even attempted set up a network, but I have not had any luck there.  Can someone please help?