I have the latest version of Firefox and Adobe Flash installed onto my machine, running Windoiws 7 Pro but when I go onto youtube videos will not even load and often firefox just crashes. All other browsers work fine. I also run firefox on my window 8.1 laptop and that also works fine. I have tried reinstalling Firefox, Disabling add-ons and running firefox in safe mode, reinstalling Adobe Flash, disabling the firewall, uninstalling realplayer - none of which solve the problem. When trying to load songs on grooveshark the following error message pops up:- "Problem Loading Flash We had a problem loading Adobe Flash. You may have a Flash blocker installed. If so, please disable the blocker (or add an exception) and reload to start listening." There are no flash blockers installed that I'm aware of! I'm out of ideas and any help would be appreciated as despite this problem, I prefer to use Firefox above other browsers. Thanks