Frozen keys when install Windows 7

I've downloaded Windows 7.iso and burned it successfully. But when it boots from the DVD and see the prompt "Press any keys to boot from CD or DVD". I pressed all keys but it didn't react or continue the process. Seems like my keyboard was disabled. But somtimes I still able to enable Cap Locks. What's this specification ?
Thanks for helping

This happens to me, too.
Anyone got a clue on how to solve this?

Maybe try a different USB port or otherwhise you can change the settings in the bios so it automatically boots from CD/DVD without your interaction. Would be interesting if your keyboard would work through the setup.

I already tried ignoring the HDs, going directly to the CD, even fixing the boot loader so it won't be 7's anymore.
Nothing helps, the keyboard shuts down just as the CD shows the message to hit a key.

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