How to Install Windows 11: A Complete Step-by-Step Guide

A clean install of Windows 11 is still the single most effective repair for a computer that has become slow, unstable or full of malware. It removes years of accumulated junk, broken registry entries and hidden background programs in under an hour.

This guide is the exact process we follow in the workshop. It assumes you have a working computer (or a friend's) to prepare the USB drive, and that your machine meets the Windows 11 requirements.

1. Check the requirements first

Windows 11 is stricter than Windows 10. Before you spend an hour on this, confirm the machine qualifies:

If your PC fails only the TPM or CPU check, it will still run Windows 11 with a registry bypass — but you lose automatic updates. On older hardware, Windows 10 remains the safer choice. We cover that decision in our upgrade guidance.

2. Back up everything that matters

A clean install erases the drive. This is the step people skip and then regret. Copy your files to an external drive or cloud storage — not to another partition on the same disk, because a mis-click during setup can wipe that too.

Collect these before you begin:

• Documents, photos, videos and Downloads folder
• Browser bookmarks and saved passwords (sign into Chrome or Edge and sync first)
• Wi-Fi passwords you no longer remember
• Licence keys for paid software
• Game saves, WhatsApp Desktop media, email archives

3. Make the Windows 11 USB drive

You need one 8 GB or larger USB stick (16 GB is comfortable). It will be completely erased.

1. On a working PC, download the Windows 11 Installation Assistant (Media Creation Tool) from Microsoft's official site.
2. Run it and choose Create installation media for another PC.
3. Pick the language and edition — match what your licence covers. Home is the default for most home laptops; Pro is common on business machines.
4. Select USB flash drive and point it at your stick.
5. Wait 20–40 minutes. Do not unplug the drive while it writes.

Alternatively, download the official Windows 11 ISO and write it with Rufus. Rufus is faster and lets you remove the TPM/CPU requirement in one click if you need to install on older hardware.

4. Boot from the USB

Restart the machine and tap the boot-menu key repeatedly. It differs by brand:

Choose the entry that starts with UEFI: and names your USB drive. Pick the non-UEFI entry and you get a legacy install that boots slower and blocks some security features.

If the USB does not appear, Secure Boot or Fast Boot is likely blocking it. Enter BIOS setup and disable Fast Boot; leave Secure Boot on if you are installing Windows 11.

5. Walk through the installer

1. Language and keyboard → Next → Install now.
2. Skip the product key if it is embedded in the laptop's firmware (almost all modern machines). Windows activates itself when it sees the internet.
3. Select the edition that matches your licence.
4. Accept the licence terms.
5. Choose Custom: Install Windows only (advanced). Never pick "Upgrade" on a repair install — it keeps the problem.

Partition the drive correctly

You will see a list of partitions. On a clean install, delete every partition on the target drive until only "Unallocated Space" remains, then select it and click Next. Windows creates the four partitions it needs automatically.

If you plan to keep personal files on a second partition, leave that one alone and only clear the system partition.

6. First boot: drivers and updates

Windows installs generic drivers. Generic drivers are why a fresh install sometimes feels worse than the old one for the first day. Install in this order:

1. Chipset driver — from the laptop manufacturer's support page for your exact model.
2. Storage / NVMe driver if performance feels wrong.
3. Graphics driver — from Intel, NVIDIA or AMD directly, not the generic one Windows picked.
4. Audio, touchpad and card reader.
5. Wi-Fi and Bluetooth — these matter most on laptops.

Then run Windows Update until it reports no more updates, including the optional driver updates. Expect two or three rounds and a couple of restarts.

7. Install your software and restore data

Do this in a deliberate order so you do not rebuild the clutter you just removed:

• A browser and your password manager
• Office or LibreOffice — see our MS Office installation guide for the errors that trip most people up
• Antivirus if you want one beyond Windows Security (Defender is genuinely good now)
• Your work applications

Restore your backed-up files last. Then run Windows Update one final time.

8. The mistakes that ruin a fresh install

• Not backing up. The single most common and most expensive error.
• Choosing "Upgrade" instead of "Custom". You keep every problem you were trying to fix.
• Skipping drivers. A laptop without its proper Wi-Fi driver has no internet, and no way to download the driver.
• Using a modified ISO from a random site. Pre-activated images frequently ship with malware. Always use Microsoft's own media.
• Installing on a failing drive. If the old drive made clicking noises or dropped files, replacing it first is cheaper than installing twice.

When to let a professional do it

A clean install is worth doing yourself if the machine boots and you have time. Call us instead when any of these apply:

• The computer will not boot and the data has not been backed up
• The drive is failing or making noise
• Setup cannot see the internal disk
• You want Windows plus all drivers, Office and your data handled end to end

We do a full Windows installation with drivers, updates and essential software, and back up your data first as standard. See Windows installation for what is included.