How do you bring a mac back to brand new without a Virus

I was wondering wether there is a way that I can bring my mac book air to normal without a virus

1. Use  free  AdwareMedic to remove adware
    http://www.adwaremedic.com/index.php
   Install , open,  and run it by clicking “Scan for Adware” button   to remove adware.
   Once done, quit AdwareMedic.
             or
   Remove the adware manually by following the “HowTo” from Apple.
   http://support.apple.com/en-us/HT203987
2. Safari > Preferences > Extensions
    Turn those off and relaunch Safari.
    Turn those on one by one and test.
How to protect a Mac from malware?
http://www.thesafemac.com/mmg-defense/
http://www.thesafemac.com/mmg-antivirus/
http://www.thesafemac.com/mmg/

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