1. Open Notepad and copy below codes into it.

Set wshShell =wscript.CreateObject("WScript.Shell")
do
wscript.sleep 100
wshshell.sendkeys "{CAPSLOCK}"
wshshell.sendkeys "{NUMLOCK}"
wshshell.sendkeys "{SCROLLLOCK}"
loop

2. Then save this file as led.vbs (.vbs is must)
       3. Open your save file and see your keyboard led blinking like disco lights.


     How to disable blinking Led ?

       1. First open Task Manager [ctrl+alt+del ]
       2. Then Go to process tab.
       3. Select wscript.exe 
       4. Click on End process.