Hi folks, I'm trying to use bootcamp to install the Windows 8.1 preview on my new MacBook Air 2013. I get as far as booting onto a USB stick and formatting the bootcamp partition. But then Windows 8.1 setup refuses to continue and says 'Setup was unable to use the existing partition because the system volume does not contain the required free space.' I've tried holding down option while booting and choosing the 'EFI' option instead of letting it boot the USB stick automatically but this doesn't make any difference. Has anyone come across this problem before? (obviously I know Windows 8.1 isn't released yet or officially supported, but it sounds like other people have got it working) Thanks in advance for any suggestions.