Installing 10.6 over 10.7

I have been having a lot of problems with my Mac Mini and 10.7.2. I ran the system installer for 10.6.x and first it told me that the machine was running "OS X 23", so I ran the disk utility which found and fixed many permission errors. I tried again and the installer again failed with a new message "cannot startup from this disk". That disk is, of course, my startup disk.
I would like to archive and install my current hard drive. How can I get past all the problems and do this? Thanks.

If that mini shipped with Lion, then it most likely won't run Snow Leopard or boot from the SL install disc.

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