Is your card getting an IP address? Is there a gateway listed. DNS servers?

Start|run|cmd
ipconfig /all

If you have a 169.x.x.x address, you are not really connected.

my card is having trouble getting an IP address

Hard to identify the problem without knowing more about your systems.

If youy don't have the wireless zero configuration service running, try starting it. Also try checking the box on the properties of the wireless device to let Windows manage the connection.

If you are using any encryption, insure that the AP and the client card have the same settings.

Try disabling, then re-enabling the connection to see if the device will connect.

Double click the connection. On the pop up windows, try clicking the 'repair' button.

That address says when the card searched for the DHCP server it did not find it.  Look for a post by jimw and in his sig is a link to winsockfix.