ASUS recommends Windows 10 Pro.

    X551CA

    Buy One.
    Get Windows 10 free.

    Buy an eligible Windows device.1
    Get your free upgrade when available at www.windows.com/Windows10upgrade.

    Windows 10 Upgrade Offer valid for qualified Windows 7 and Windows 8.1 devices (including devices you already own) for one year after Windows 10 upgrade availability.
    Visit http://www.asus.com/event/2015/osupgrade/ for more details.

    • Not all features may be available when upgrading to Windows 10 from Windows 7 or Windows 8.1 PCs.
    • Your system may require additional hardware, drivers, software, firmware, and/or BIOS update.
    • Upgrading between versions may incur additional fees.
    1. Pre-release product shown, subject to change. Apps sold separately. Windows 10 Upgrade Offer valid for qualified Windows 7 and Windows 8.1 devices (including devices you already own) for one year after Windows 10 upgrade availability. Availability of Windows 10 features may vary by device. Upgrading may require additional hardware, drivers, software, firmware, and/or BIOS update. Upgrading between Windows editions may incur additional fees. Some editions are excluded: Windows 7 Enterprise, Windows 8/8.1 Enterprise, and Windows RT/RT 8.1. Visit http://www.windows.com/Windows10upgrade for more details.