I recently purchased a new computer. I put the whole thing together but the only thing is I have no cd drives yet. So, I need to boot up Windows 7 another way. The only external hard drive I have is my 500gb My Book. I tried a program called wintoflash, that was supposed to both make my hard drive bootable for the new computer and copy Windows 7. However, even after getting in the BIOS and setting the usb to boot up first, it says invalid disk. I've seen other websites that make the harddrive bootable through DOS but the're all for vista owners, I'm still using XP. So, I was just wondering if anybody knew how I could boot Windows 7 on my new computer using an external hard drive?