hello, did you also run the setup, after you've downloaded it? [[Install Firefox on Windows]] please also note that you have loads of outdated plugins present, which have multiple securtiy vulnerabilities & will put your system and your personal data at risk each time you're on the web or they might already be compromised. please uninstall the multiple old shockwave flash & director plugins from the windows control panel & [https://www.mozilla.org/plugincheck/ keep the other plugins updated]. you should probably do a full scan of your system with the security software already in place and different other tool like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] ...