My computer runs very slow then freezes and I keep getting the above error message. I uninstalled Flash Player and my computer was much faster and I no longer had freezes/error messages.
I re-installed Flash Player last week and guess what? Back to freezes and 'Unresponsive Plugin' error messages!!
I have thus uninstalled Flash yet again - and the computer is again much faster and not freezing!
I use Mozilla Firefox as my browser and according to some forums there are known compatability problems between these two systems.
I don't give a toss whose fault it is. Can the 2 of you please put your heads together and sort this problem out once and for all!!!!!!