From your comments, I would suggest possibly there is a DVD drive problem. If you have Windows 7 already installed, and have another partition on the computer, copy rthe entire contents of the DVD to a folder (call it setup, or anything familiar). Run the setup from that folder.
But, ref your post #4. You will not be able to (legally) activate the OS on more than one computer.
P.S. Like your Avatar, Pat. Reminds me of how I feel when I get up in the morning!