How do I downgrade back to 10.7? No Time Machine restore option?

I just installed Mac OS 10.8 (Mountain Lion) and it displays poorly on my HDTV. I want to go back to 10.7.
How do I downgrade back to 10.7? I didn't have a Time Machine running back when I had 10.7 (my huge mistakek) so the restore option is not available. I tried using my "Install Mac 10.7 (Lion)" installer and I get an error message saying it can not install from the 10.8 system. What tha?
I tried to go to my 10.6.4 Mac OS X Install DVD and it crashes my Mac mini when I try to boot from it.
HELP anyone, PLEASE!!!

Boot from your Install Mac 10.7 (Lion) installer
A. Erase the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your startup volume (usually Macintosh HD) from the left side list. Click on the Erase tab in the DU main window.
Set the format type to Mac OS Extended (Journaled.) Click on the Erase button and wait until the process has completed.
Quit DU and return to the main menu.
B. Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

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How do I downgrade back to 10.7? No Time Machine restore option?

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