In Windows Vista, Windows 2008, and Windows 7 (all editions), DSP Group's TrueSpeech voice codec that Yahoo! Voice Chat utilizes is no longer shipped/distributed with these operating systems. If you are a user of one of these operating systems then you'll want to download and install the TrueSpeech voice codec on your system regardless of what version of Yahoo! Messenger you have installed. Yahoo! updated it's Yacscom.dll voice library (after Vista was released) to handle the required TrueSpeech PCM wave audio compression and decompression
but it does not correctly decompress audio for playback in certain circumstances (when it's been tampered with). As a result, Yahoo! Messenger, or any calling application that's using Yacscom.dll build 50, can experience a crash (in Yahoo! Messenger this happens as an instant silent exception that causes it to forcefully close).
IF you have been in a chat room with voice or in a voice conference and out of the blue had Yahoo! Messenger silently crash and close down completely then this is certainly the culprit. You will want to download and install the DSP TrueSpeech voice codec on your system, regardless of whether or not this has happened to you
yet, and this problem will be eliminated.
DSP Group's TrueSpeech Codec Installer (built and provided by the 3rd party ByteScribe company) --> http://www.bytescribe.com/downloads/tsp_codec_install.exeYou can alternatively download this codec installer from our website --> http://ytkpro.com/YM_Resources/tsp_codec_install.exeRun the installer with administrator privileges and a reboot is recommended.