Airport Card won't connect after changing wireless networks

Hello,
I have a black macbook with an internal airport extreme wireless card. I use the computer at school and at home. Both school and home have functioning wireless networks in which other computers are connected and running with no problems.
When I open my laptop and wake it from sleep after changing from school to home or visa versa the airport card often will not recognize the wireless network. On many occations, even when the network is recognized it will not automatically connect to it (I have it set to do). A message saying "There was an error joining the network" comes up. The only resolution has been to reset the computer (which doesn't always work) or reset the PRAM.
Sometimes after reseting the PRAM the computer doesn't even recognize that I have an airport card installed at all. When this happens I have to reset the PRAM again to resolve it.
As a final note, when the computer doesn't automatically recognize the network and I click on the desktop wireless network icon, I get the "spinning beach ball" for a period of time before the drop down box with the available networks shows up. This seems strange to me because it shouldn't be a RAM issue as I have 2GB of ram installed on this computer.
Any help would be appreciated.
K.
MacBook (Intel) Mac OS X (10.4.8)

Try the following:
Delete Preferred Network(s)
- System Preferences > Network > AirPort > Configure
- In the "By default, join:" pull-down menu, select "Preferred networks"
- Delete the network(s) you regularly use from the list
Delete AirPort Keychain Entries
- Launch the "Keychain Access" application located in Applications/Utilties.
- Click on the "Kind" filter at the top, and look for any "AirPort network password" entries...and delete them.
- Restart, or log out then back in.
Add Preferred Network(s)
- System Preferences > Network > AirPort > Configure
- In the "By default, join:" pull-down menu, select "Preferred networks"
- Add the preferred network(s) using the "+" button.
- Restart or log out then back in.
If you haven't already, you may want to consider creating a network location for each (school & home) with the appropriate network settings required for connectivity at each. For each location, you can set the preferred network.

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Airport Card won't connect after changing wireless networks

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