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Hi Terry, Are you wanting to set your computer back?
If so.
You need to boot the system to the Recovery HD. Hold down Command+r key at startup. Open Disk Utility and erase the Macintosh HD. Exit out of DU and select Reinstall Mac OS X. Select Macintosh HD as the place to install to and wait for OS to be downloaded from the net. The computer will restart when the download is finshed and the install will start.
There is no 'Factory Reset' button as such. If you are running OS 10.7 to 10.10, then you need to start up from the 'recovery' partition (CMD+R) on startup. You will then be able to erase the hard drive using 'Disk Utility' and then re-install the OS.
Hard to say without knowing exactly what Mac you have and what specs, but most likely reason would be your system doesn't meet the requirements (From Apple support site) - To install Mavericks, you need one of these Macs:
iMac (Mid-2007 or later)
MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
MacBook Pro (13-inch, Mid-2009 or later),
MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
MacBook Air (Late 2008 or later)
Mac mini (Early 2009 or later)
Mac Pro (Early 2008 or later)
Xserve (Early 2009)
Your Mac also needs:
OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
Use Disk Utility to erase the hard drive. ... The process of resetting a Mac or MacBook tofactory settings gets rid of all your data ... This cloned drive can be re-cloned back to the main drive if you decide to restore your Mac, or it can be used to ... This means it will no longer be linked to your iTunes account. MacBook supportnumber 1 800 726 0294 Apple Technical Help
Start up from a Mac OS X Install disc (one whose version is closest to the version of Mac OS X installed). Usually, you can start from the disc by putting it in your computer, restarting, and holding the C key. Or, put it in the computer and click the Install or Restore icon you see in the disc's main window (after which the computer will start from the disc without you needing to hold C). Or, you can use Startup Manager or the Startup Disk preference pane to select the Install disc.
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Mac OS X v10.6 or later: Choose Password Reset from the Utilities menu. Mac OS X v10.5 or v10.4: Choose Reset Password from the Utilities menu. Mac OS X v10.3: Choose Reset Password from the Installer menu.
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