In order to fix the issue, try removing all Audio Visual Maths files from your computer using Revo Uninstaller. After that, run a registry cleaner from Software Informer database to make sure that there are no leftover registry keys in your system and try to install the program again. If it doesn't work and you're using Windows XP or below, use the package provided by Microsoft to update Windows Installer. If you're using Windows Vista or above, update it through Windows Update.
