Sometimes when you start   internet explorer- 6 you found some error.
“Internet explorer has encountered a problem with an add-on and needs to close”
Because some add-ons files are destroy, crashed or not compatible and when you trying to open internet explorer its show this type error, but you can solve this problem, disabled following add-ons whose create error.
For disabled add-ons follow these steps

1.When you found this type error dialog box, click on advanced button. » Read more: Internet explorer has encountered a problem – quick solution