I'm trying to restore Windows 7 on my machine from a usb mounted ISO. When I try to start it up in safemode, start-up stalls on disk.sys load. When I try to boot from the usb ISO, I get a black screen with a blinking cursor. Is there a way, without being able to boot in safemode and without access to cmd, to completely wipe the windows partition and reinstall from the usb ISO? It's a Gateway dx4300, 2.6 AMD processor.