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Windows <strong>10</strong> is also compatible with most virtualization software, including Hyper-V in Windows<br />

Server installations and Windows 8.1 PCs.<br />

System requirements<br />

The hardware requirements for Windows <strong>10</strong> are identical to those of Windows 7 and Windows 8.1, so<br />

any device that can run either of those operating systems should be capable of running Windows <strong>10</strong>. In<br />

addition, most desktop applications that run on Windows 7 should also run on Windows <strong>10</strong>.<br />

To install Windows <strong>10</strong>, you need sufficient free storage space (at least 16 GB for 32-bit versions and<br />

20 GB for 64-bit) and sufficient installed RAM (a minimum of 1 GB for 32-bit, 2 GB for 64-bit), or the<br />

installation will be blocked.<br />

The following device types are incompatible with Windows <strong>10</strong>:<br />

■■<br />

■■<br />

■■<br />

The Surface RT, Surface 2, and other devices running Windows RT are not compatible with<br />

Windows <strong>10</strong>.<br />

Some older CPUs lack capabilities that are required by Windows <strong>10</strong>. The processor must support<br />

Physical Address Extensions (PAE); Data Execution Protection, via the No-eXecute (NX) pageprotection<br />

feature or the eXecute Disable (XD) bit feature; and Streaming SIMD Extensions 2<br />

(SSE2). In addition, a small number of older PCs might be blocked from 64-bit installations because<br />

their processors don’t support specific instructions like these: CMPXCHG16b, PrefetchW,<br />

and LAHF/SAHF.<br />

The Windows <strong>10</strong> Mobile operating system, although closely related to Windows <strong>10</strong> in many<br />

respects, is delivered separately. Windows <strong>10</strong> editions built for installation on PCs will not work<br />

on phones.<br />

Supported upgrade paths<br />

Upgrading via Windows Update offers the simplest experience, preserving all installed desktop programs,<br />

Windows Store apps, personal files, and settings. When you use this option, the Windows <strong>10</strong><br />

upgrade edition is the equivalent of the previous edition. Thus, Windows 7 Home Premium upgrades<br />

to Windows <strong>10</strong> Home, and upgrading from Windows 7 Professional and Ultimate or Windows 8.1 Pro<br />

results in an installation of Windows <strong>10</strong> Pro.<br />

You also can upgrade from a lesser edition—from Windows 8.1 Core to Windows <strong>10</strong> Pro, for example.<br />

I’ll say more about upgrade options later in this chapter.<br />

Creating and using installation media<br />

With Windows <strong>10</strong>, Microsoft is making installation media widely available to the general public for the<br />

first time ever. To get started, visit Microsoft’s Get Windows <strong>10</strong> page, at http://www.microsoft.com/enus/software-download/windows<strong>10</strong>.<br />

To upgrade a single PC with the least fuss, click the Upgrade Now<br />

button and follow the prompts.<br />

36 CHAPTER 3 Installation and activation

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