Probably because you're running an x64 version of Windows 7, and Nbtstat.exe
is an x64 only app -- so it isn't normally available to 32-bit apps (who get
a remapped \windows\system32 directory with 32-bit equivalents). This is a
nbtstat works with Take Command 11 x64, and it works with TCC v9 & v10 if
you turn off the "Win64 File System Redirection" option (OPTION/Startup).