Re-image my Mac?

After I downloaded Mavericks, my MacBook Pro started to get very slow and unhappy. I have backed everything up. How can I re-image ?

It's best to describe the problem in as much relevant detail as possible, rather than what you think is causing it or how you think it should be solved.

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    Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
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    Are you following the instructions outlined in these?
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