The problem may be detected during the K2000 Media Manager KBE build process, with errors such as this:
Access is denied
It may go through and map drives, but not be able to bring up the main menu:
Antivirus software can prevent the modification of the base WinPE environment included in the Windows AIK/ADK, resulting in a vanilla WinPE environment being uploaded to the K2000 instead of a proper KBE with all of the specific drivers and KACE modifications.
McAfee has an article on their website that details the problem when running their anti-virus software:
Perform the following steps:
See the following Knowledge Base article on setting up a VM for building KBEs: