If the process is actually completing its work and returning a spurious exit code, you could ignore that particular code by adding it to the
Success exit codes field.
http://www.kinook.com/VisBuildPro/Manual/programtab.htm
You should be able to reproduce the problem outside Visual Build by running a Command Prompt under the Administrator account and creating and running a batch file as described in the 2nd post at
http://www.kinook.com/Forum/showthread.php?threadid=438