I upgraded to OS X Mavericks. I am not happy with it. How do I delete it? Thanks

I recently downloaded OS X Maverecks. I am not happy with it. How do I delete it and go back to my original setup? Thanks

JB6569,
do you have a Time Machine backup of your MacBook Pro from before you’d installed Mavericks? If so, you can restore from that backup.
If you don’t have a pre-Mavericks backup, then first I’d recommend purchasing an external drive onto which you can make a Time Machine backup of what you currently have installed. Once you’ve made a backup, or if you’ve decided that you don’t need to preserve your data, you’ll need to boot into Recovery mode by holding down a Command key and the R key as you start up your MacBook Pro. When you see the Mac OS X Utilities menu, select Disk Utility and use it to erase your MacBook Pro’s internal disk. After restarting, OS X Internet Recovery will let you download your MacBook Pro’s originally installed version of OS X (Lion) from Apple’s servers, and will then proceed to install it. Once it’s been installed, you can then restore your data (if any) from the Time Machine backup.

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