My Internet Explorer has an Unhandled Exception message

Hi TechyV Experts,
The issue I have is regarding Internet Explorer. But before that, let me give you a few details regarding my home computer. I am using a Windows XP Home edition operating system on a HP 5850 desktop. The version of my Internet Explorer is 6. And, in the past I have not installed any software that automatically showed this error.
Whenever I open Internet Explorer, an error would appear telling me something about an Unhandled Exception. I do not know what exactly this error implies. And, as a result of it, I cannot open Internet Explorer. I have Mozilla Firefox as a back-up, but I do not want to use if forever.
Please help.
