Have you had a look through the options screen and/or the documentation (press F1 while VoiceAttack has focus to open VoiceAttackHelp.pdf in your default PDF viewer)?
As the log entry mentions, it can be disabled using the VoiceAttack Options window, and as the documentation suggests, that would be using the "Show Third-Party App Warnings" option on the "System / Advanced" tab.
The message you saw regarding file corruption would have pertained to your configuration file, I.E. the file that stores most of the settings that aren't specific to a given profile, including the one for that warning, which is enabled by default, and as such was enabled when the default settings were restored to recover from the corrupt file.
File corruption is very rare, so if this occurs more than once, you'll want to check whether your machine is in good health (or have someone else check for you), including hardware like RAM and HDDs/SSDs.