Last week I created a Windows 8.1 Update 1 image with MDT 2013. During the Sysprep and Capture proces, the following error message came up. Time to take some action if you ask me! ;)
Looking on Microsoft TechNet the following answer was found:
This problem occurs because the LTIApply.wsf script fails to check for the existence of the boot folder on the system partition before the script runs the takeown.exe command to change ownership on the folder. The takeown.exe command fails with a "Not Found" error if the boot folder doesn't exist. This causes the Sysprep and Capture task sequence to fail.
For the workaround have a look here: https://support.microsoft.com/kb/2797676?wa=wsignin1.0
Great it works that way!