You'll want to double check the following settings:

1. DHCP is enabled in your wireless access point.
2. Make sure that your wireless nic's mac address is allowed permission to connect.
3. Generate a new wep key and distribute it to your laptop. If you've lost the old key somewhere, you don't want it in the wrong hands.
4. Make sure that your laptop has the correct settings to connect to an Access Point or Ad-Hoc network.
5. Make sure at least temporarily that you have ssid broadcast enabled on your Access Point, so it makes it easier for the client to connect. After your client is able to find the access point and connect using the new Wep key, all should be good and ssid broadcast can be disabled.

Hope this works for you.

PuRe