Windows 11 installation: Everything you need to know

Windows 11 can be installed using an in-place upgrade or a clean installation, each with different trade-offs.
In-place upgrades preserve files, apps, and most settings, while clean installs deliver better stability.
Unsupported hardware can still run Windows 11, but without official support or guaranteed updates.
Microsoft offers multiple installation tools, including Windows Update, ISO files, USB media, and recovery options.

Windows 11 offers several ways to install or upgrade your computer, including an in-place upgrade, a clean installation, and methods for installing the operating system on unsupported hardware. The right approach depends on whether you want to keep your files and apps, start fresh, or install Windows 11 on a computer that doesn’t meet the minimum system requirements.

In-place upgrade: Installs Windows 11 while preserving your files, apps, and most settings.
Clean installation: Removes the existing installation and provides a fresh Windows 11 setup, requiring you to restore your files and reinstall your apps.
Unsupported hardware: Lets you install Windows 11 on an incompatible computer, but without Microsoft support or guarantees of compatibility and updates.

Microsoft provides several installation options, including Windows Update, the Installation Assistant, ISO files, bootable USB media, and built-in recovery tools.

In this guide, I’ll explain the differences between these installation methods and show you the available options for installing Windows 11, whether you’re upgrading from an older version, reinstalling the operating system, or using unsupported hardware.

Windows 11 in-place upgrade
Windows 11 clean installation
Windows 11 install on unsupported hardware

Windows 11 in-place upgrade

An in-place upgrade refers to upgrading your current installation to Windows 11 (or Windows 10). When you use this process, the new version of the operating system will install, preserving your files, apps, and most settings.

The setup also creates a copy of the current installation in case something goes wrong and you need to roll back to the previous version.

Microsoft offers several ways to upgrade to Windows 11, depending on the Windows version installed on the computer (Windows 10, 8.1, or 7).

You can upgrade from Windows 10 to Windows 11 in at least four ways. You can upgrade through Windows Update settings, which Microsoft usually recommends. The process will download and install the new version of Windows like a monthly update, but it will take longer because it’s a new version and requires reinstallation.

You can download and mount the ISO file in File Explorer, and then launch Windows Setup and choose the option to keep your files, apps, and settings.

You can use the Windows 11 ISO file to upgrade a device running Windows 10, 8.1, or 7.

How to upgrade to Windows 11 from Windows 8.1

Another recommended upgrade method is the Installation Assistant. This tool lets you upgrade a laptop or desktop through a process similar to Windows Update. However, you can use it to force the installation at any time. This option is available only for computers running Windows 10.

After installation, if something goes wrong or you are not ready, you can roll back to the previous version within the first 10 days.

How to upgrade to Windows 11 from Windows 7

If you upgrade from Windows 7, the setup will not let you keep settings or applications. Only the files will be preserved.

Microsoft also releases feature updates for Windows 11, which also upgrade the operating system. The current version is 26H2, and you can install it in several ways.

Windows 11 clean installation

A clean installation removes the existing Windows installation and installs a fresh copy of Windows 11. Depending on the installation method and selected partitions, you may also need to erase existing data.

This is usually the best option for installing a new version of Windows because it reduces the risk of issues during and after installation. It can also help resolve existing issues in the current setup, such as performance problems, shutdown and boot failures, and more.

Since a clean installation erases everything on the computer, it’s the best option for upgrading from older versions, such as Windows 10, 8.1, 7, and even older versions, as long as the hardware meets the minimum requirements.

Microsoft offers multiple ways to perform a fresh installation. You can create a bootable USB drive to start the computer and continue the setup.

This option is usually for upgrading a system or installing Windows on an empty hard drive. You can also connect the USB flash drive media to the computer while the operating system is running to start the setup and use the Keep nothing option to perform a clean installation.

You can mount the ISO file in File Explorer, launch the installer, and select the “Keep nothing” option to perform a clean installation.

Alternatively, if the device is already running Windows 11 but is causing problems, you can perform a clean installation using the “Reset this PC” recovery option. This feature wipes out the hard drive and reinstalls Windows 11 without using additional tools. You can reinstall Windows using the locally available image or download a fresh image from the cloud.

The cloud option comes in handy if one or more installation files in the local image are damaged, or if the computer uses a custom manufacturer image and you want a clean installation without custom settings and pre-installed applications.

If the device does not boot, the Advanced startup options environment includes the same options available with the “Reset this PC” feature.

You can use this option only to reinstall the same version of Windows 11 that was already installed on the computer.

You can also install Windows 11 without bloatware. I mean the default promotional apps Microsoft includes with every setup. To install without bloatware, select “English (World)” or “English (Europe)” in the “language” setting, then follow the on-screen instructions to complete the clean install.

How to install Windows 11 without bloatware apps

Another way to perform a clean installation, free of junk apps and unnecessary features, is to use the Tiny11 Builder script to create a custom, unsupported USB flash drive, then run the installer to set up a minimal Windows 11 installation.

How to download Tiny11 ISO for Windows 11 26H2

Although the default setup requires a Microsoft account to install Windows 11, you can bypass this requirement by selecting the “Domain join instead” option during Windows 11 Pro setup. If you have the “Home” edition, you can disable the internet connection to continue with a local account.

How to install Windows 11 without a Microsoft account

Windows 11 install on unsupported hardware

If your computer has unsupported hardware, you can still install Windows 11. However, this method is not supported because the device may experience performance and reliability issues. You won’t be offered an upgrade to the next version, and you may encounter additional errors, such as Blue Screen of Death (BSoD) and driver issues.

If you want to proceed with the unsupported method on a device that doesn’t meet the minimum hardware requirements, you have multiple options. The easiest way is to create a bootable USB drive with Rufus or Ventoy, then use it to start the computer and proceed with the installation.

You can also mount the Windows 11 ISO and launch the Windows Setup with a special command in Command Prompt to bypass the requirements. However, if you already have a device running version 24H2, you only need to install the enablement package to upgrade to version 25H2.

Although you can install the operating system on older hardware that may not meet system requirements, the computer still needs a processor that supports the “POPCNT” (Population Count) instruction. Otherwise, the computer won’t boot. This usually affects chips released before 2007.

Do you have any questions about the installation process? Let me know in the comments.

Windows 11 in-place upgrade

Windows 11 clean installation

Windows 11 install on unsupported hardware

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