Make your Computer Welcome You Sound

Step1- Open Notepad and copy & paste this code

Dim speaks, speech

speaks="Welcome to your PC, Username" (username like as Anand)

Set speech=CreateObject("sapi.spvoice")

speech.Speak speaks

Step 2- Save this file to .vbs format (like as Anand.vbs).

Step3- Copy this file and paste Startup folder (click start-All Programs- Startup-                Open-Paste).

Step4-Restart Computer and Enjoy.

For Better Result 

Go To Control Panel and click Sound & Audio Device and Click Sound tab 

Select No Sound for Sound Scheme Option and Save.