You may have already tried this but the following worked for me on the DZ68BC when I had trouble starting Win 7 x64 setup CD recently. It would start booting but not get as far as the graphical setup interface.
Simply, for troubleshooting purposes, disconnect all cables from the rear and exterior of the case except for power and video to start with. Especially disconnect all USB. Disconnect any LAN connections also. If any better, add kb/mouse. Then start adding connections back from there if this advice helps.
In my case some USB devices did not like being connected to certain types of USB ports, such as USB 3 or charging ports. As soon as I disconnected everything as I have advised you, I had a functioning system again, and then I had to carefully select which USB ports to reconnect devices to.
This may have nothing to do with your problem, but worth trying if you have not already tried.
Be interesting to hear how you resolve it in the end.
Elliott37, you may also want to try taking the motherboard out of the chassis and use minimal configuration.
If you are able to access the BIOS, check if you need to update the BIOS or use another Windows installation CD or a new Windows Image.
You can also remove the battery in order to clear the CMOS.
Please let us know if you got it to work and how.