I tried to do it this way:
Dim objFSO, outFile, wshShell
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set outFile = objFSO.CreateTextFile("paint.bat", True)
outFile.WriteLine "taskkill /f /im mspaint.exe"
Set wshShell = CreateObject("WScript.Shell")
wshShell.Run "paint.bat", 0, false
that was to work but of an error saying "The file is already being used by another process"