Guides, decisions and official sources

Start with the two walkthroughs

If you have already decided a clean install is necessary and have a tested backup, these are the complete procedures. They use the literal screen labels the operating systems show, and they call out the places where widely copied instructions are wrong.

• Reinstall Windows 11From official ISO and USB media through partitioning, drivers and activation, in ten steps.
• Reinstall macOSRecovery on Apple silicon and Intel, Disk Utility, and a clean install that keeps nothing behind.

Decision guides

These are not shorter versions of the walkthroughs. Each one is about a single decision — whether to reinstall at all, whether a backup is actually restorable, what Secure Boot is for, what the partition screen is showing you — and each ends with the mistakes people make at that point.

• Do you need a clean install at all? Reset this PC, an in-place upgrade, a reinstall and a clean install are four different operations. Choosing the wrong one costs an afternoon, or your files.
• A backup you can actually restore A backup that has never been opened is a guess. How to make one, how to test it, and the recovery keys you need before erasing an encrypted disk.
• Secure Boot, TPM 2.0 and the Windows 11 requirements Why disabling Secure Boot is the wrong fix, what TPM 2.0 actually does, and how to check both before you build installation media.
• Building installation media that actually boots Media Creation Tool, a direct ISO and a USB writer, or Apple's createinstallmedia: what each is for, and the sizing and formatting mistakes that waste an afternoon.
• The Windows partition screen, read slowly The one screen in Windows setup where a misread label destroys data. What 'Drive 0 Partition 1' means, which entries belong to Windows, and when to stop and unplug drives.
• Drivers and activation after a clean Windows install What Windows Update already handles, when a vendor driver is genuinely needed, and how a digital licence reattaches to the same hardware without a key.
• Apple silicon and Intel Macs: Recovery is not the same How to enter Recovery on each, what differs on the screen that follows, and why SMC and NVRAM resets do not exist on Apple silicon.
• Disk Utility: erase, volume groups and the point of no return What Disk Utility is showing you on a modern Mac, why 'show all devices' changes the options, and how to erase only what you intend to erase.
• When a reinstall will not fix the problem A fresh system that still shows the same fault is diagnostic evidence. How to read it, and what to test instead of reinstalling a third time.
• The first 24 hours after a clean install A staged, deliberately boring first day: updates, activation, drivers, a small restore, and a day of normal use before the old backup is wiped.

Official source pages

The downloads page lists every link on this site, all of them pointing at the vendor's own domain. These pages explain what each source actually offers, which of its options to use, and the ways it is commonly misused. A tool that writes an image to a USB stick is not a source of that image; the distinction is the editorial rule this site is built on.

• Microsoft's Windows 11 download page: which of the three options to use Installation Assistant, Media Creation Tool or a direct ISO — what each one is for, and why the hostname in the address bar is the whole point.
• The Windows 10 download page, and its deadline Why Windows 10 is still downloadable, why it is a compatibility fallback rather than a destination, and how to decide honestly between the two.
• The 90-day Windows Enterprise evaluation, used properly A genuine, free, time-limited image from Microsoft. What it is for, what it is not, and why it is the honest answer to 'I just need a test machine'.
• Microsoft's own installation-media instructions Why the vendor's support article beats a tutorial screenshot when the prompts change, and what the article actually covers.
• Apple's macOS Recovery documentation What Apple's own Recovery articles cover, why the Apple silicon and Intel instructions are separate, and the sentence that protects your files.
• Apple's bootable installer instructions createinstallmedia, the 32 GB stick, and the case where Recovery is not enough. What the command does and what can go wrong.
• Rufus: a USB writer, not a source of Windows What Rufus is for, the options worth leaving alone, and why the image you feed it still has to come from Microsoft.
• Ventoy and balenaEtcher: two other ways to write an image One stick for several installers versus the simplest possible write. When each is useful, and the failure each one introduces.
• The Windows Insider Program: pre-release builds, not a free Windows What the Insider Program actually is, how the builds arrive through Windows Update, and why it is a test channel rather than a source of install media for a production machine.
• Windows release health: check this before you reinstall Microsoft's own dashboard of known issues and rollout status for every supported Windows release, and why reading it can save you from a reinstall that fixes nothing.
• Windows 11 system requirements: check before you download 5.5 GB The published Windows 11 hardware requirements, what each one means in practice, and the honest alternatives when a machine does not qualify.
• Where macOS actually comes from: App Store, Software Update and Recovery Apple does not publish macOS as a public ISO. This page explains the real routes to an installer and why a normal reinstall needs no separately downloaded image.
• Apple Developer downloads: full installers and betas, with caveats Apple's own developer resource centre, which hosts full macOS installers and beta software. What is there, the account it needs, and why betas are not daily-driver material.
• The Mac App Store and the macOS installer Where the App Store links on Apple's macOS page lead, why the installer arrives as a normal purchase, and why there is no visible ISO to save.
• balenaEtcher: the fewest-decisions USB writer What Etcher is for, why its simplicity is about the write and not the source, and how it fits alongside Rufus and Ventoy for writing official images.
• Ubuntu Desktop: get the image from Canonical Canonical's own download page for Ubuntu Desktop, why the image must come from the project's domain, and how it fits a reinstall-or-replace decision.
• Fedora Workstation: get the image from the Fedora Project The Fedora Project's official Workstation image, why it must come from the project's own site, and how it compares as a Linux alternative.
• Debian: get the installation images from the Debian Project The Debian Project's official installation images, why they must come from debian.org, and how Debian fits as a stability-first Linux alternative.

How the opinions are sourced

Every guide ends with the vendor documentation it was checked against, and the sources page publishes the full list and the citation rules. We do not quote benchmarks, test scores or screenshots, and we do not present an opinion as though a vendor endorsed it. The about page describes what we check and what we do not.