To kill a process that does not stop gracefully when you issue a Stop command from the Services GUI window you can use the built-in command line tool taskkill.exe. The following shows an example on its syntax:

Example Code - Killing a PID (4584)

C:\>taskkill /pid 4584
SUCCESS: Sent termination signal to the process with PID 4584.

Example Code - Killing a Process Name (calc.exe)
C:\>taskkill /im calc.exe
SUCCESS: Sent termination signal to the process "calc.exe" with PID 3948.