COMException was unhandle

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C#

C#4.0

i am using the code is

SpeechVoiceSpeakFlags my_Spflag = SpeechVoiceSpeakFlags.SVSFlagsAsync; 
SpVoice my_Voice = new SpVoice();  
my_Voice.Speak(textBox1.Text, my_Spflag);
my_Voice.Volume = 5;
my_Voice.Rate = 2;

Retrieving the COM class factory for component with CLSID {96749377-3391-11D2-9EE3-00C04F797396} failed due to the following error: 80040154.

This is my Exception

line was SpVoice my_voice =new SpVoice();

anyone please help to handle the COMException in this project
please it's urgent