[Tinky]

My friend has asked for me to help her. We are unable to launch Mozilla Firefox browser on her lappy, we have tried all we can think of, including reinstalling it, but to no avail. At one stage we were told it was already running, but there was no sign of it. It did work up until a few days ago. Any sensible suggestions please? The last thing we did was to install 'Personas' on it would that have caused it to stop working if something was corrupted in the process?