So I am a college student and have downloaded my windows 7 onto my iMac via a USB drive and have partitioned my drive. The issue is I can't load from the USB drive and when I burned it to a DVD-R but when trying to install it the screen says, "can't locate BOOTMGR file" well I can see that file on the cd and the USB drive. What can I do? I really need windows up and running for video games and projects. Thank you