I don't have one of those, but I have used the other two types of Intel card (3945 and 4965).
The ipw 2200 firmware that needs to be loaded for your card is already included in the Fedora 8 and 9 distributions and it should just be a matter of activating it. No need to install anything else.
It can also be a bit different depending on if you are running Fedora 8 or 9?
If it is 8 did you install from a DVD or CD?
If it is 8 have you managed to do any updating since you installed over a wired connection?
Running the command:
if you are using Fedora 8 will sort that out.
That error message you are seeing though is usually the result of trying to control your card the wrong way.
Fedora now assumes that something called NetworkManager will control your card. It lives on your Gnome panel somewhere in the notification area near the clock. It usually makes connecting to a wireless network much easier than the alternative which you are using - "Gnome System Menu - Administration - Network".
Indeed if it is running it can actually interfere with the older method that you appear to be using producing the error messages you see.
If you have been experimenting in "Gnome System Menu - Administration - Network" then at the very least you will need to set the card NOT to "Activate device when computer starts". It should be set to be "controlled by NetworkManager" if it is available.
Sorry if there are so many alternatives there, Wireless Networking has changed hugely over the past 8 or 9 months in Fedora and you haven't specified where you are on the update curve.
Give NetworkManager a trial and post back with any questions and the answers to mine.