How to install old OS

What does the apple community think, Also on my brand new Mac Book Pro it is really laggy and almost everytime i get a colour wheel and have to force quit. Does anyone know how to install old OS

Yep! Just find the box, or whereever you put the Mac OS X Install DVD, put it into the drive, restart and reformat/reinstall.
Just make sure to back up your files.

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    Is posible?

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