My keyboard freezes after booting


I want to reinstall my windows 7. i made the cd already. the problem is, when it is asking me to press a button to boot from cd,my keyboard freezes.i cant press anything with it.i can choose the disc in the booting menu,but cant do anything with it. what could solve this problem?maybe there is a way to bypass the pressing screen?

Please help.

I didn't find the right solution from the Internet.

http://www.tomshardware.com/forum/29757 ... es-booting
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