How can I re - adjust my iMac back to factory settings?

My iMac has slowed to where I can barely use it. It also expands the page I look without any in put me. I think that the only cure is to go back to the first day. I backed up my files. How can I re - adjust my iMac back to factory settings?

Allows you to reformat your Mac OS X Recovery > OS X Recovery.

Tags: Mac

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