Snow Leopard still won't install...

So I purchased the Snow Leopard DVD from the apple store and attempted to install it, but after only installing it less than a 1/4 of the way-the disc ejected and the computer restarted.  I spoke to apple support twice-the first time they stated that I did not have enough available disk space, however I have 393.13 GB available.  I called back and they believed I had a defective disc so they sent me another one and the same thing happened at the exact same point of the installation process.  I've cleaned out many files using CleanMyMac, as well as 'Erasing Free Space' and ran the HD test with no issues found.  Is there any reason anyone may know of for why Snow Leopard will not install considering I have more than the 5gb disk space needed and 2GB ram when only 1GB is needed.  Could any programs that I have installed be causing an issue.  I do not have a back-up system, so emptying my mac and installing from scratch is not an option.

burn your important files do a DVD/CD as a backup.
Then power off the Mac.
Put the snl disc in the slot, power up push in the disc hold the "c" key down till the gear stops spinnig. this will show if it will start from a bootable disc

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    Alright, here goes. Thank you in advance.
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    FUNCTIONALITY:
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  • I used my snow leopard disk to erase my hard drive. Now I want to eject the snow leopard disk to clean install from the lion boot disk I made. How do I eject the snow leopard disk?

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