1.Open Notepad and copy and paste the following code into it
Dim message, sapi
message=InputBox("What do you want me to say?","Speak to Me")
2.Now save the notepad file with the name speak.vbs at your desktop.
3.Now double click on speak.vbs type in the box whatever you want your computer to speak for you.
I have a sample uploaded here, just download it to your windows PC and double click on it.
I have hosted the above file in my DropBox Public folder.(Learn How)
More tech tips at Digital Inspiration's Blog can be found here