Restart your PC and press your boot menu key (often F12 , F9 , or Esc ) to select the USB drive as the primary boot device. A Note on Security
"All-in-One" ISOs often include both x86 (32-bit) and x64 (64-bit) versions in a single installer. Restart your PC and press your boot menu
Many non-essential Windows features and legacy drivers are removed to save disk space and RAM. Restart your PC and press your boot menu
Insert a USB flash drive with at least 8 GB of storage. Restart your PC and press your boot menu
Some modern custom ISOs include integrated USB 3.0 and NVMe drivers, which were not natively supported in the original 2009 release. System Requirements