Mackbook internal keyboard fails to work after connecting external keyboard

I am using 13 inch alum macbook. The keyboard and trackpad has always been good.
Today, I tried to connect it to an external wireless logitech keyboard. Initially things do not work. Macbook does not recognize the external keyboard, and ask me to press the key on the right hand side of the left shift key. I tried to press a couple of times, and realized that the wireless keyboard has been running out of battery (has not been using that for a while). After I changed the new batteries, things are connected. However, I am not sure what key I pressed to answer macbook's question. Anyway, most keys work as expected (the 26 letters), but windows key on the external keyboard works as the apple command key. Then I downloaded the doublecommand software trying to remap keys.
Suddenly, I found that the external keyboard fails to work. I then try the internal keyboard, which fails as well. I then disconnect the external keyboard/mouse/display, and restart the machine. The trackpad works ok, but the internal keyboard still fails to work and thus I can not login (can not enter my password). Restarted a couple of times and the situation remains.
I tend to believe this is a software problem related to the mess up of the external keyboard. I tried to boot the machine using the original installation DVD and repaired the permissions of the hardisk. This did not fix the problem.
Please help. Thanks.

Problem solved.
It was the "doublecommand" software that I installed after connecting the external keyboard.
I called the Apple Technical Support. They helped me to boot into the safe mode (press Shift when turn on your computer until you see the login screen), and uninstall the software. Things are back to normal.
Apple technical support is very professional and knowledgeable. Thanks.

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Mackbook internal keyboard fails to work after connecting external keyboard

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