MacBook Keys not working even after KeyBoard Firmware update

My friend's sister bought me a MacBook from the US last October. Fortunately, Apple announced the release of Leopard also on the same month and I got a free upgrade to leopard. I installed leopard about 3 months back. My keyboard was working fine when I had Tiger installed. After I installed Leopard, I remember installing a Keyboard firmware update once through the Software Update.
About two three weeks back, my MacBook started acting wierd. Some keys were not working (mostly 't', 'q', left shift, left command, zero which is not working even now. I couldn't close the last bracket because the key is not working. I am a php programmer and I can't think of living without the closing bracket and zero keys . But most of the keys works on and off.
After seeing on several sites that it is a problem with firmware, I once again downloaded the firware update, but couldn't install it since the installation wizard says that my system doesn't need it.
Can someone plz tell me what to do now? Will reinstalling help?
Thanks in advance.

The problem persists everytime I restart my system or wake it up from sleep. But each time different keys have problem. I am now downloading update 10.5.4. Can someone plz help me?

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