To add speech recognition
Speech recognition is normally added automatically as a text service when it is installed. Use this procedure only if it you removed it as a text service and want to add it.
Open Regional and Language Options in Control Panel.
On the Languages tab, under Text services and input languages, click Details.
Under Installed services, click Add.
In the Input language list, click an input language.
Select the Speech check box, and then click an option in the list.
Speech recognition engines are language-specific. The first three Microsoft speech engines that are available are Simplified Chinese, U.S. English, and Japanese. Engines for other languages will become available.
To open Regional and Language Options, click Start, click Control Panel, click Date, Time, Language, and Regional Options, and then click Regional and Language Options.
Speech recognition requires computer memory and can affect your computer's performance, so you should remove it as a text service if you so not use it.
If speech recognition is not available, it may not be installed. For more information, click Related Topics.
For more detailed information about using speech recognition, click the Help button on the Language bar.
If a language does not appear in the Input language list, the fonts for that language might not be installed. For information about installing East Asian and complex script languages, click Related Topics.