Hello, At one point I had Windows 7 on my machine in a partition. I needed the space, so I nuked the partition. Well , my computer program for firing my fireworks this year is PC only. So ... I need to get it back. When I open bootcamp to make it happen I get the message : The disk cannot be partitioned because some files cannot be moved. Back up the disk and use Disk Utility to format it as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using Boot Camp Assistant again. So, I am not sure what is going on. I may not have removed the old partition (Win 7) right. I figured I may as well backup stuff, nuke, and start over. I have an external 1 TB laying around with nothing on it. Do I need to do this, or can I get around doing a clean install. Thanks in advance.