Unwanted popup window that shutsdown my broweser

Question

I am frustrated with an iexplorer window that pops up everytime I am online. It says Explorer is experiencing an error and my browser will be shut down. It asks if I want microsoft to be sent a report or not. Whatever choice I make shuts down my browser. Also when I press control alt delete, I get a notice that my taskmanager has been disabled by the administrator but I never did. Please help me. thanks.