Open Windows Services from Command Prompt:
C:\WINDOWS\system32>services.msc
Double click on the Service and make a note of the Service Name.
sc queryex xxx
NOTE: xxx is the Service Name identified earlier.
C:\WINDOWS\system32>taskkill /PID xxx /F
NOTE: xxx is the PID identified earlier.
returns:
SUCCESS: The process with PID 508 has been terminated.