Yes after my original post I updated to latest version and that took care of the error message relating to the System.Speech.dll file. However upon pressing the audio link using IE 11 I hear no sound, I also have not been prompted to whether I want allow the Windows Media Player add-on. I can't see any Windows Media Player Add-on in the add-ons. NOTE the audio works fine when using Firefox.
In any case I have opted, for now, to disable the audio so as not to confuse IE users. Your code didn't quite work with the Findcontrol not being able to retrieve the RadCaptcha of id: "RadSocialShare1_captcha". Upon debugging I can see that the ID of the RadCaptcha is the same as the staticID which is in this case is "ct100_MainContent_RadSocialShare1_captcha", such is why find control is not finding it.
I can manage to disable it using the following code:
For Each ctrl As Control In TryCast(RadSocialShare1.FindControl(RadSocialShare1.ID + "_emailPopup"), RadWindow).ContentContainer.Controls(0).Controls
If TypeOf ctrl Is RadCaptcha Then
Dim captcha As RadCaptcha = TryCast(ctrl, RadCaptcha)
captcha.CaptchaImage.EnableCaptchaAudio = False
Unless you can recommend a more efficient way, I'll just go with that code.
Thanks for your help. Greatly appreciated.