My computer boots from the usb but as soon as the animation graphics of windows 7 saying "Starting Windows" with 4 dots revolving around appears, it stops there. I made my usb bootable for gpt partition scheme using RUFUS tool "". I want to downgrade to windows 7 with the same gpt partition scheme and UEFI mode. Download here Run ImgBrn and select 'Create image file from disc' Select the source as the Windows 7 DVD disk and the destination to the 'USB' folder with the filename 'Windows7.iso' Click the left bottom left icon ImgBrn to start.