Hi FLOOD my pc has been switched off and restarted a couple of times with me uninstalling Firefox and then reinstalling trying to get it to work but still no joy. To run the system in safe mode is going to require plenty setting changes toget windows to boot in safe mode. The problem only started after the silent install of software update and all was fine until I restarted pc yesterday morning and found Firefox no longer working so cannot see how by starting pc in safe mode will prove anything. Where can I upload the getsystem info you asked for as I do not want my system open for all and sundry to look at, thanks in advance