• Start CMD with administrative rights
• Find service you want to kill (in this case “spooler”)

C:\Windows\system32>sc queryex | findstr /I spoo
SERVICE_NAME: Spooler
DISPLAY_NAME: Print Spooler

• Now we know the right name of service (SERVICE_NAME: Spooler) and we can find its PID

C:\Windows\system32>sc queryex Spooler |findstr PID
        PID                : 3480

• With known PID we can now kill the process

taskkill /f /pid 3480
SUCCESS: The process with PID 3480 has been terminated