Step1: Create Bootable USB Drive. Start PowerISO (v6.5 or newer version, download here). Insert the USB drive you intend to boot from. Choose the menu "Tools > Create ...
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Après l'installation et l'exécution de l'outil, cliquez sur Parcourir pour sélectionner l'image ISO de Windows 8.1. Continuez en cliquant sur Suivant . Sélectionnez la clé USB en cliquant sur Périphérique USB puis sur Commencer la copie . PC Astuces - Créer une clé USB d'installation de Windows 8.1 Installer Windows 8.1 Pour installer Windows 8.1 depuis votre clé USB vous devez "booter" dessus, c'est-à-dire démarrer votre ordinateur sur la clé USB. Pour cela, vous devez paramétrer le BIOS de votre ordinateur pour lui indiquer de booter en premier sur votre clé USB à la place de votre disque dur. How to Boot Windows 8 or 8.1 from USB Flash Drive Part 3: Boot Windows 8/8.1 from the Bootable USB Drive Normally, your computer is set to boot from the main hard drive. But you could change this configuration.
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My hard drive randomly decided to stop booting my windows os so I downloaded a windows 8.1 ISO and installed it to my USB using Unetbootin. In my BIOS, launch csm is disabled as well as fast boot. My USB is formatted to fat32 with the unetbootin program.
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