Have you moved the DbgHelp files into their corresponding bin directories?
C:\Program Files (x86)\Visual Leak Detector\dbghelp\x86\dbghelp.dll & Microsoft.DTfW.DHL.manifest
=> C:\Program Files (x86)\Visual Leak Detector\bin\Win32\
C:\Program Files (x86)\Visual Leak Detector\dbghelp\x64\dbghelp.dll & Microsoft.DTfW.DHL.manifest
=> C:\Program Files (x86)\Visual Leak Detector\bin\Win64\
C:\Program Files (x86)\Visual Leak Detector\dbghelp\x86\dbghelp.dll & Microsoft.DTfW.DHL.manifest
=> C:\Program Files (x86)\Visual Leak Detector\bin\Win32\
C:\Program Files (x86)\Visual Leak Detector\dbghelp\x64\dbghelp.dll & Microsoft.DTfW.DHL.manifest
=> C:\Program Files (x86)\Visual Leak Detector\bin\Win64\