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When started from Windows Update, the upgrade process offers no options. All user accounts,<br />
desktop programs, apps, and data files are migrated in place. In general, an installation should take<br />
no more than a couple of hours, and it can be much faster. The image-based installation has been<br />
field-tested on hundreds of millions of PCs over the past few years. If something goes wrong, the Setup<br />
program will automatically roll back to the previous version of Windows with all data files and configuration<br />
details unchanged.<br />
Note If you use a third-party disk-encryption tool, take extra time before you even think<br />
about moving to Windows <strong>10</strong> on a device with encrypted storage. The in-place upgrade<br />
process should work flawlessly on systems protected with BitLocker encryption, but the<br />
Windows installer isn’t able to access disks encrypted using third-party software. Your safest<br />
option is to disable all encryption before upgrading, and then run the encryption software<br />
again after the upgrade is complete. Check with the provider of any third-party encryption<br />
software before upgrading to ensure that the software is compatible with Windows <strong>10</strong>.<br />
You also can start an upgrade from Windows 7 or Windows 8.1 by using physical installation media<br />
or a mounted ISO file and double-clicking Setup from the installation source. Choosing this option<br />
kicks off the familiar Windows upgrade workflow. It also offers additional options at the start, as shown<br />
in Figure 3-6.<br />
FIGURE 3-6 When you start an upgrade from an existing copy of Windows 7 or 8.1, choosing the last option on this<br />
list performs the equivalent of a clean install.<br />
42 CHAPTER 3 Installation and activation