Solved!
Added commands in the first .vbs file to call another .vbs file. This another .vbs file displays a popup on the screen with an only "OK" button. When "ok" button is pressed, the rest of code kill the wscript.exe application.
'This was added in first .vbs file to call the second .vbs file:
Dim objShell
Set objShell = Wscript.CreateObject("WScript.Shell")
objShell.Run "inter.vbs"
Set objShell = Nothing
'This is added in second .vbs file to display message and then kill the wscript.exe after "ok" button is pressed:
x=msgbox ("Message", 0+16+4096, "Tittle")
strComputer = "."
strProcess = "'wscript.exe'"
Set objWMIService = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate}!\\" _
& strComputer & "\root\cimv2")
Set colProcess = objWMIService.ExecQuery _
("Select * from Win32_Process Where Name = " & strProcess )
For Each objProcess in colProcess
objProcess.Terminate()
Next