Clé USB branchée sur un PC gamer pendant une installation de Windows

Clean Install Windows 11: The Complete 2026 Guide

A clean installation of Windows 11 guarantees a fast, stable system, free from the unnecessary software that accumulates over the years. Whether you have just built a PC, switched to a new SSD, or your current machine is showing signs of fatigue, reinstalling the system from scratch remains the most effective method for a fresh start. This guide walks you through it step by step, from creating the USB drive to the initial setup after installation.

Before you begin: prerequisites

A clean installation erases all content on the system drive. The first step is therefore to back up your important data: documents, photos, game saves not synced to the cloud, passwords, and browser bookmarks. An external drive or a cloud service will do the trick.

  • A USB drive with at least 8 GB of space (its contents will be erased)
  • A second functional PC to prepare the USB drive (or your current PC before formatting)
  • Your Windows license: if Windows was already activated on the machine, the digital license will reactivate automatically after reinstallation
  • An Internet connection, now required by the Windows 11 installer

Regarding hardware, Windows 11 officially requires a recent 64-bit processor, 4 GB of RAM, 64 GB of storage, UEFI with Secure Boot, and a TPM 2.0 chip. All PCs assembled in recent years, including DSGate configurations, meet these requirements without any special manipulation.

Step 1: create the installation USB drive

Microsoft provides an official free tool, the Media Creation Tool, downloadable from the "Download Windows 11" page on microsoft.com. Launch it, accept the terms, choose the language and edition, then select "USB flash drive." The tool will download the system image and prepare the drive automatically, which takes about twenty minutes depending on your connection.

The Rufus alternative

Advanced users may prefer Rufus, a free utility that writes the official ISO image to a USB drive. Its benefit: it offers additional options, such as creating a local account during installation or disabling certain configuration prompts. In this case, download the Windows 11 ISO from the Microsoft website, then select it in Rufus with your USB drive as the destination.

Step 2: boot from the USB drive

Plug the drive into the PC you wish to install on, preferably into a USB port on the back of the motherboard. Turn on the machine and open the boot menu by tapping the designated key as soon as the logo screen appears:

  • F11 or F8 on most MSI and ASRock motherboards
  • F12 on Gigabyte
  • F8 on ASUS
  • If that fails, enter the BIOS with Delete and set the USB drive as the first boot priority

Select the line mentioning "UEFI" followed by the name of your drive. The Windows 11 installer will then launch on a blue background.

Step 3: the installation process itself

Choose the language and keyboard layout, then click "Install now." If Windows asks for a product key and your machine already had one, click "I don't have a product key": activation will happen automatically once you connect to the Internet.

The crucial point: partitions

Select the custom installation (not the upgrade). You will arrive at the partition screen, the most important step for a truly clean installation:

  • Identify the destination drive (check its capacity to avoid making a mistake)
  • Delete all partitions on that drive: primary partition, recovery partition, EFI system partition
  • Select the remaining unallocated space and click "Next"

Windows will recreate the necessary partitions itself with optimal alignment. If you have multiple drives, do not touch the others: only the system drive should be wiped.

Copying the files then takes between 5 and 15 minutes on an NVMe SSD, with one or two automatic restarts. Do not remove the drive before the setup screen appears.

Step 4: initial configuration

Windows 11 will go through a series of questions: region, keyboard, network, and then the Microsoft account. Take the time to read the privacy screens and disable options you do not use (location, personalized ads, optional diagnostic data). You can decline the Microsoft 365, Game Pass, and OneDrive offers presented at the end—they will remain available later if needed.

Step 5: drivers and updates

Once on the desktop, three steps are necessary, in this order:

  • Windows Update: Settings > Windows Update, run the search, and install everything, including optional driver updates. Restart, then repeat until there is nothing left.
  • Chipset drivers: go to the AMD or Intel website depending on your platform and install the chipset driver corresponding to your motherboard. This is particularly important on AMD platforms for proper management of processor cores.
  • Graphics driver: download the latest driver from the Nvidia website (Nvidia app) or AMD (Adrenalin). The generic driver installed by Windows is not enough for optimal gaming.

Step 6: useful settings for gaming

A few minutes of configuration significantly improve the daily experience:

  • Enable Game Mode in Settings > Gaming
  • Check that Hardware-accelerated GPU scheduling is enabled in graphics settings
  • Set the Power mode to "High performance"
  • Uninstall pre-installed applications you won't use via Settings > Apps
  • Enable the maximum refresh rate for your screen in Settings > System > Display > Advanced display — a setting often forgotten on 144 Hz screens and higher

What if the installation stalls?

The most common hang-ups have simple solutions. If the USB drive does not appear at startup, verify that it was created in UEFI/GPT mode and try another port. If the installer refuses to start due to TPM or Secure Boot, enable these options in the BIOS (often found in "Security" or "Boot" menus). Finally, if the drive is not detected on a recent Intel platform, load the storage driver provided by the motherboard manufacturer or disable VMD mode in the BIOS.

In summary

Official USB drive, complete deletion of system drive partitions, up-to-date chipset and graphics drivers: these are the three pillars of a successful Windows 11 installation. Count on about one hour in total, including restarts and updates, to restore a responsive and healthy system.

And if you prefer to avoid this step, DSGate gaming PCs are delivered with Windows 11 cleanly installed, activated, and updated, drivers included: assembled in France, they are ready to play from the very first boot.

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