To ensure the ISO is genuine and has not been tampered with, you should verify its SHA-1 hash using the built-in Windows Microsoft Community Hub Command Prompt certutil -hashfile "path\to\your\file.iso" SHA1 the output to known official hashes: 64-bit Ultimate SP1 36AE90DEFBAD9D9539E649B193AE573B77A71C83 32-bit Professional SP1 DA5E224B15DF0A6C1103A7937AC7A1250C2F0D18 Microsoft Community Hub Creating Bootable Media Once you have a verified ISO, use a tool like