Can't change language of browser

OS: Windows 7 Ultimate 64-bit
Security software: ESET Nod 32 Antivirus
I tried to change language of browser in settings, restarted and language didn’t change.
Tried to restart PC, but it didn’t help too.
When i change language it directs me to http://download.comodo.com/IceDragon/languages/25.0.0.1/ru.xpi but there is 404 Not found error.