I just purchased a 2011 MBA that I want to install Windows 7 on. Trying to use Boot Camp Assistant but getting stuck on the USB Boot Drive creation. Here's what I've gone through so far... Boot Camp Assistant asked for a Windows 7 Disk Image. I have a Windows 7 Home Premium DVD in an external drive. Used Disk Utility to create a dvd/cd disk image that I saved on my hard drive. I renamed the image it created to end with an .iso extension. Boot Camp Assistant recognizes the image and recognized my 4 GB USB flash drive as the destination. Boot Camp formats the drive but throws out an error: "your bootable usb drive could not be created". Any idea what's up?