open notepad and write this
" dim speaks, speech
speaks="write here welcome message or user_name"
set speech= createobject("sapi.spvoice")
speech.speak speaks"
now save it start.vbs (file_name.vbs).
now click on (START button -> all programe -> startup ) than right click on startup option and choose explore option than (startup window will open )than paste start.vbs file in it.
when you start your computer your message will play
thanks
