I've been using this tool for 2 years, and I have no problems with it. I recommend you to perform a new installation of this software, because there can be multiple causes that makes it unavailable (a missing file, a failed update, etc.). Go to Control Panel > Uninstall a program. After that, I recommend you to download the latest version of this application, but​ this time download it from its official webpage. After the download is complete, open the setup file and start the installation process once again.