You have seen in many movies when actor starts his computer it welcome him by name.You can also Do same thing in your computer.This trick include two steps first making vbs file and placing it in start up folder in c drive.
Now let first make a vbs file:
1.Open Notepad.
2.Type below code in it
Dim Message,Speak
Message="Welcome to your pc maneesh have a good day"
Set Speak=CreateObject("sapi.spvoice")
Speak.Speak Message
3.You can change message to any text you want your computetr speak.
4. Save this file with *.vbs name.
Now let place this file in window startup folder.
In window7 address of start up folder:
C:\Users\Maneesh\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\starup