e-Speaking uses the speech engine from Microsoft called "SAPI" (Speech Application Program Interface).
That means you need to have the Microsoft speech engine installed and running on your computer prior to installing and running e-Speaking.
You can get more information about downloading and installing SAPI 5.1 from Microsoft at: www.e-speaking.com/sapi.htm
e-Speaking also uses .NET software libraries from Microsoft.
If you need to install .NET, you can do so by going to the Microsoft Windows Update page.