Take the 2-minute tour ×  I have a strange problem on Windows
Vista (Automatic updates).  Long time ago I had installed
Firefox, Thunderbird, Safari and Opera and they all worked well.
Once upon a time, after Windows restart, Firefox, Thunderbird
and Safari won't start. [Opera (USB) works fine].  When I start
the browser, program name is listed on the processes list, but
it is not activated, doesn't show any window.  I tried crating
new profiles with -ProfileManager, restarting Windows,
reinstalling the browsers. I scanned the system for suspected
programs and it looks clean. There is 45GB of free HDD space.
share|improve this question add comment  1 Answer  Have you
attempted to uninstall the browsers, and then re-installing
them? If you don't uninstall sometimes fragments are not
reinstalled.... It's rare, but it happens....  Also, check your
permissions on the application support folders for those
browsers...  share|improve this answer add comment  Your Answer