No KiXtart does not support the OUT method required to determine WHO is running the process. You will need to use VBS to do this as you're doing now.

Basically get the user name on the process then kill it with WMI using the process ID or if possible the owner.

You can look on Microsoft's site for further information on WMI code samples they also have a download of their scripts in a CHM file that makes it easy to locate specific code.