Perform a registry backup (regedit /E C:\path\to\backupreg.reg), then modify / create this key:
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Installer. Add a value for a new string value (REG_SZ) named
Logging, with the value as
voicewarmupx. That will open up full debugging on the MSI.
Now run the uninstaller again. When it fails, you'll be able to pull a file out of the %TEMP%\MSI*.log. Note the datetime and grab the one that was used with this uninstall and upload that here.