Unfortunately, a failed update or a missing file, etc. can make your answering unavailable. Therefore, a simple and efficient solution to resolve this issue, is to reinstall NetWaiting. Before you start the reinstallation process again, you need to uninstall this application (go to Control Panel > Uninstall a program, or you can use an uninstalling tool). Download again the setup files through its official webpage. After the download is complete, open the setup file and start the installation process.