Dear Lee,
Now both Little Reader and Little Math has no sound? or is it Little Reader only?
You need to see if its the computer problem or software problem that caused no sound to play first.
Would you check if the sound is ok for all other computer function or not? Probably open any you tube video and see if the sound is playing or not.
If there is no sound in all computer function, then you may need to check the computer.
Here is the trouble shoot from Windows for computer has no sound:
http://windows.microsoft.com/en-us/windows/tips-fixing-common-sound-problems#tips-fixing-common-sound-problems=windows-7However, if the 'no sound' is unfortunately happen only with Brillkids software while all the rest of the computer function normally, This problem may be due to outdated audio driver, audio codec conflicts, or media player problems.
Here is the link to window driver update
http://windows.microsoft.com/en-us/windows/no-sound-help#no-sound=windows-7&v1h=win8tab1&v2h=win7tab4&v3h=winvistatab1&v4h=winxptab1I also found that this support article may be useful for you.
It mentioned that if you are experiencing problems with sound not playing back for audio files or in video, or video is not playing, then the most likely reason is that there are codec problems on your system.
http://support.brillkids.com/entries/20426547-the-sounds-in-little-reader-keep-on-getting-cut-offYou will need to download the codec pack from the link provided in that support article.
Hope your problem is solved soon.
Vicky Lee