Hi mooneyham,
Welcome to the forums!
Please check your bios and ensure that the first boot priority is the DVD (not the Hard disk drive) OR USB if you are installing Win 7 from a USB, also unplug any other DVD drives or external USB devices if you have more than one.
Some Motherboards like my Gigabyte allow me to press a button after the bios loads and choose to boot from any of my installed media devices; but this is a one-off and a reboot reverts back to the default boot device that was configured in the Bios.