After firefox update last night to 36.0.4. I cannot open Firefox. It says Firefox is already running, but is not responding. The old Firefox process must be closed to open. I try to close it under task manager, it is not listed under process but under details - Cannot end task, as it says access is denied. I try to look for help on the net. It says to delete the file PARENT.LOCK, It says action cannot be complete as the file is open in Firefox. I try to shut down my computer, even log out on my current user but cannot delete the file Parent.lock. I am using a win 8.0 The easiest way is to uninstall and to install a fresh application, but will this wipe out all my bookmarks etc....

Thanks, Coco