Why is there two wireless cards?

By "another card that can be removed easily", I can only assume you mean a wireless card connected to the USB port. As far as what I remember with these laptops, there normally is only one wireless card in the system; so if someone had troubles with the internal card, the easiest thing to do is bypass the connection with an external wireless adapter.

Make sure that the easily removed card is indeed wireless, and whether or not your wireless connection works with just your internal card. To find out on Windows XP:

1. Right Click My Computer

2. Select Manage

3. Select Device Manager

4. Double Click on Network Adapters

If any one of those are disabled or have a Yellow Exclamation mark on them you should be able to fix that pretty easily. Additionally, if you remove the card and nothing disappears from that list, you are guaranteed that it is for something else other than networking.