Hey everybody,
Based on the files I received recently and other things reported in this thread, I’m pretty sure this is security related. Try temporarily uninstalling your security programs and see if it fixes the error message. If it does, add exceptions to your security software for both WoW (Located in World of Warcraft\ _retail _) and WoWVoiceProxy (Located in World of Warcraft\ _retail _\Utils) applications. You’ll also want to report the false positive to your security’s support team.
If it still doesn’t work with your security uninstalled, please send an MSInfo using these instructions. I’ll need more information in this case.