1. When you boot with your Win 7 OS installation DVD (or with the Win 7 OS Windows USB Media Tool flash drive) connected, access the boot menu during the boot process. You need to press the appropriate F key on your keyboard too access the boot menu. (It's also possible a key other than a F key will be the appropriate key). The appropriate key depends upon your motherboard's designation. If you don't know the appropriate key consult your motherboard's documentation (or try each F key in turn). Capiche?
2. When the boot menu appears the connected installation media will be listed as a SATA device and ALSO a UEFI device. Click on the UEFI device designation so that the system will boot to the UEFI interface.
3. You should then be able...