I have installed mountain lion on my macbook pro ,but it made my mac very slow. Would someone please tell me how  to uninstall this one and reinstall snow leopard?

Hello,
I have installed mountain lion on my macbook pro ,but it made my mac very slow. Would someone please tell me how  to uninstall this one and reinstall snow leopard? I tried to do it by my original CDs but macbook  pro didn't let me to do it.
Thanks

It would be easier to just fix whatever is making your machine slow.
I wrote a little diagnostic program to help show what might be causing these problems. Download EtreCheck from http://www.etresoft.com/download/EtreCheck.zip, run it, and paste the results here.
Disclaimer: Although EtreCheck is free, there are other links on my site that could give me some form of compensation, financial or otherwise.

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    I wrote a little diagnostic program to help show what might be causing these problems. Download EtreCheck from http://www.etresoft.com/download/EtreCheck.zip, run it, and paste the results here.
    Disclaimer: Although EtreCheck is free, there are other links on my site that could give me some form of compensation, financial or otherwise.

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    It would be easier to just fix whatever is making your machine slow.
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    Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
    Boot to the Recovery HD:
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    Erase the hard drive:
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      2. 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.
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