I'm unable to open Firefox in Windows 7. Can you help?
There can be many causes for your problem. I suggest you to uninstall the application using Add or Remove Programs feature and to run AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system. After that, go to Mozilla official web page using another web browser and download and install the latest version of Firefox. Also, check the Mozilla Support solutions.