Robert is trying to install Windows 7 onto a MacBook Air, but he gets an error with BootCamp that the partition isn't NTFS. Leo says that one known problem is with the Mac Fusion Drive. If it's just an SSD however, it should work. He'll have to format the disc in Windows Installer, not BootCamp. Apple doesn't do NTFS, it just partitions the hard drive. Let Windows installer do the formatting of NTFS during the installation. Press "O" for options. He'll also need the Apple drivers.
Another choice is using Crossover for Windows, or run it into virtualization with Oracle's Virtual Box. It's a free virtual machine that will run and install Windows virtually.