Twenty minutes of preparation prevents the two classic install disasters — files lost because the backup was never checked, and a reinstalled PC that will not activate because the wrong edition went on.
Setup itself is the easy part. What goes wrong in real installs almost always happened before the first setup screen: no backup, an unchecked backup, a missing recovery key, or the wrong edition installed. This checklist closes all four doors, in order.
The six checks worth doing before setup starts. Example list — tick them off in this order.
Copy documents, photos, desktop files and anything in Downloads to an external drive or another PC. Do not forget browser bookmarks (export them from the browser's bookmark manager) and game saves or app data you care about. Then the step everyone skips: open the backup and check a few files actually open. A backup you never opened is a hope, not a backup — and a clean install cannot be undone once the drive is erased.
Many modern laptops encrypt the drive automatically with BitLocker or Device Encryption. If you ever need to read that drive outside this Windows — from another PC or a recovery tool — Windows will ask for a 48-digit recovery key. For most home PCs the key is stored in your Microsoft account at aka.ms/myrecoverykey. Sign in there from your phone, find the key for this PC and save a copy somewhere that is not this PC.
The free reactivation trick has one condition: install the same edition. Press Windows + R, type winver and note whether it says Home or Pro. Also glance at Settings → System → Activation to confirm Windows is currently activated. If it is, the licence lives on the hardware and Microsoft's servers — no key needs to be written down.
Honest warnings: the tool erases the USB drive, so use an empty one, and 8 GB is the minimum size. Tools like Rufus and Ventoy also work and this channel has guides for them, but the official tool is the safest default for a first install.
Press Windows + R, type msinfo32 and check BIOS Mode. On any PC from the last decade it should say UEFI — that is the mode Windows 11 expects. Also find out your PC's boot menu key now (F12 Dell, F9 HP, F8/Esc on many others), not while setup is waiting on you. Laptop users: plug in the charger and leave it in until the desktop appears.
The full setup — bootable USB, every install screen and the first sign in — shown live, step by step.
▶️ Watch Full Video8 GB or more. The Media Creation Tool formats the drive while making it bootable, so anything already saved on that USB is erased — use an empty or spare drive.
Choosing Upgrade over an existing Windows keeps files and apps, but it is not a clean install and rarely fixes a broken system. For a clean install there is no shortcut: back up first, because the drive you select in setup is erased.
For most home PCs it is saved in your Microsoft account at aka.ms/myrecoverykey. Sign in from another device, match the key to this PC, and store a copy somewhere other than the PC you are about to reinstall.