The following error is observed when trying to import WinPE files into the boot image using boot disk creator:
Missing operating system files
Boot Disk Creator is not able to mount the WinPE image files.
Deployment Solution 6.9 SP6
Ghost Solution Suite 3.0, 3.1
WinPE 4.0, 5.x, 10
Grant proper permissions to the service account on the server.
Disable Antivirus temporarily if installed. This issue is known to be caused by McAfee, WebRoot, and Microsoft Security Essentials, but could be caused by any Anti Virus or Intrusion Protection software, depending on the configuration.