I thnk there is an issue with Server and Boot Camp Assistant.
You don't "place" the ISO on USB, you have to write so that it is no longer a single file but a standard installer with all the files and directories.
And it is a DVD or 4.4GB Flash memory device.
create a Windows support software (drivers) CD or USB storage media
The Boot Camp Assistant can burn Boot Camp software (drivers) to a DVD or copy it to a USB storage device, such as a flash drive or hard drive. These are the only media you can use to install Boot Camp software.
- Installation Guide Instructions for all features and settings.
- Boot Camp 4.0 FAQ Get answers to commonly asked Boot Camp questions.
- Windows 7 FAQ Answers to commonly asked Windows 7 questions.