How can I delete all the data in Mac pro and install the latest version of OSX Mavericks?

Hi,
I want to know why my mac become slow and so, I want to data and system and I want to install the latest version OS X Mcvericks. How can I do?
Thanks

Open the App Store app:
And, choose Mavericks:
Then download and run the installer. Tip: It would be a good idea to quit the installer before proceding with the install, so that you can copy it or move it to location outside of your Applications folder. That way the installer won't be deleted after you run it.
If you don't have a backup of your current Lion partition, the only way that you can do a clean install is to erase that partition, thus losing all of your data.

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