I run Internet Explorer for two reasons.

A) I haven't bothered installing any other browser on this computer

B) It is the only browser I've tried (IE, FF, Chrome) that didn't crash every five minutes. Actually Chrome (While I loved it to death) just randomly stopped working one day. It wouldn't even start. FF got slowed down by all the extensions.

IE just works for me. When it fails to live up to my expectations I'll go out and try Chrome again (which minus the crashing is my favorite).