If you want to perform a fresh install of the application on your computer, you need to first completely remove it from your computer. To do this, use Revo Uninstaller and then AdwCleaner. After the application is completely gone, go to Start > Run > regedit and press Enter. In the new window, go to HKEYLOCALMACHINE \ SOFTWARE search and delete any entries related to VentiTV.
When you done all the mentioned things, insert the installer disc and begin the installation process. You should be able to complete this without any problems. For additional information, check the following User Manual.