How do you uninstall MountainLion?

    Is there a way to uninstall Mountain Lion permanently?
     Ever since Mountain Lion was installed on our MacBook pro, it has not been functioning properly and the computer has been running slower. So It would be really helpful if soneone can answer this question. Thanks.
It is a 2010 MacBook Pro running on version 10.8

Yes, I try to advise many people about how 10.8 will slow down their older machines, but one man is no match against Apple.
If your files are altered by 10.8 versions of software, then you have to learn to get them into a neutral state.
How to revert your Mac to Snow Leopard
If you have your files from 10.6 on a external drive or 10.6 TimeMachine drive then the instructions are easier
How to erase and install Snow Leopard 10.6
The important thing is making sure the ENTIRE drive is erased via the 10.6 disk, to catch the hidden partitions, GUID etc so that the 10.6 disk can repair them if you need too.

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