Kix is a 32-bit app. When you run something in a command prompt on an x64 platform, you're running a 64-bit command. Try this to invoke the 32-bit version of the command:
 Code:
$Cmd = '%COMSPEC% /c %WINDIR%\SysWOW64\netsh.exe trace stop'
'Running: ' $Cmd @CRLF
Shell $Cmd
@SERROR @CRLF
Always use environment vars to specify CMD (COMSPEC) and C:\Windows (WINDIR) so it adjusts to the local system configuration.

Some utilities just won't run from the 32-bit shell, but usually have 32-bit versions in the alternate folder location. When weird stuff like this happens, check the folder and adjust the path of what you're calling. Without a full path, it will default to the 64-bit version.

Glenn
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Actually I am a Rocket Scientist! \:D