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#31
You need to be able to boot the Win7 DVD to make repairs if Win7 won't start.
Have you booted a CD/DVD before? Do you know how to set it in BIOS so that it prompts you to Press Any Key to Boot DVD? Are you getting that prompt? If not set it correctly: How to Boot your Computer from a Bootable CD or DVD
If you get the prompt to Press Any Key and DVD won't boot, then try another bootable CD/DVD to see if it will boot and run. If so, then replace the DVD. You can try extracting the ISO file using imgBurn, then burn another DVD at 4x speed with verify. If you used this image to write flash stick, it should burn another DVD okay.