Maya helped him download a free tool called “Rufus” (for Windows) or “BalenaEtcher” (for Mac/Linux). They used it to put a Windows or Linux installer onto an 8GB+ USB stick. This USB becomes a mini repair kit.
The computer now launched the Windows/Linux installer from the USB. Leo chose “Repair your computer” or “Install now” and then “Custom: Install Windows only (advanced).” There, he saw a list of drives and partitions. He selected his main hard drive, clicked Format , and confirmed. how to format a hard drive from bios
Leo restarted his PC and repeatedly pressed the key for BIOS setup—usually F2, Del, Esc, or F10 (the screen flashes the correct key for a moment). Once inside, he navigated to the Boot Menu or Boot Order section. Maya helped him download a free tool called