Well, that's pretty unspecific. It might've gotten a virus, you might have Windows Vista (buggy), or it might be because you have the WORST INTERNET BROWSER EVER.
Firefox or Google Chrome almost never crashes.
They're faster, customizable, user-friendly, and help you download better.
Anything by Windows is usually shoddily made, and very buggy.
STOP SUPPORTING MICROSOFT!!! Yay!
Yea, sorry, I might have insulted you, but still, someone's gotta spread the good word.