To turn off Speech Recognition:
1. Click Start, and then click Control Panel.
2. Click Date, Time, Language, and Regional Options.
3. Click Regional and Language Options.
4. On the Languages tab, click Details.
5. Under Installed services, click Speech Recognition, click Remove, and then click OK.
6. Click OK to apply all the changes. You may have to restart your computer.
(courtesy of Microsoft website)
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