Can't boot from install DVD

I was repairing permissions hoping to fix my issues with USB mouse & keyboard not being recognized from sleep mode & ran "verify disk". I received several errors that the disk could not be verified and that I should try repairing the disk from the snow leopard install disk. I've tried holding down the "C" key at start-up and tried holding down the "Option" key at start up... neither works. I can select the DVD install disk holding down the option key, but the drive only engages for 5-6 seconds and stops. All I get is the grey apple logo...no spinning clock icon.... nothing. I'm running 10.6.6 with a 10.6.3 install disk. Suggestions??