Hello,
Perhaps you can use a command line taskkill operation (see the link below)- it's basically like the task manager operation, and I think should do the trick. To execute commands from LabVIEW as in a command prompt, you can use the System Exec VI which can be found in the Communication palette in LabVIEW. To get started, the following string used for the "command line" input to the System Exec VI should open that text file in notepad: (provided that "C:/test.txt" is indeed a path to a file named test.txt)
notepad.exe "C:/test.txt"
Windows XP/2000 Commands and Tools
Best Regards,
JLS