Mozilla firefox

i don't what is happening to my pc when i open any website in internet explorer whenever i open it within a few seconds i get a message like internet explorer encountered an error and needs to be closed. we are sorry for inconvenience. so tried whatever i could but nothing worked. so switch to new browser service that is Mozilla Firefox. i now i am more than satisfied with its multiple features which include multiple taps. micros oft took lot of time to launch IE .7. but who need as we have this Mozilla Firefox before its launch.