After Snow Leopard unable to updates

Hi,
After I installed the upgrade for MAC OSX Snow Leopard, I'm no longer able to install any updates sent by Apple when you go on "Software Update", I have a list of new upgrdes to perform, click on agree to all questions and it send me back to the start asking me to install upgrades or not. That is happening after upgrades have been download to my machine.
I dont know how to solve this and would like to have apple upgrades.
the software is legit and purchased on an Apple store.
Thanks,

The basic approach KT mentions also sometimes works even if not using a custom keyboard. I also would add a few steps.
Go to ~/Library/preferences/ByHost/ and delete all com.apple.HIToolbox files.
Restart your Mac.
Go to your user account preference pane.
Unlock the lock
Type your password.
Lock the lock.

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    After a Firefox upgrade/update, your firewall may not recognize that new version and will not allow access to the internet; that is your firewall doing its job. You may need to
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