DES

Hello, Does anyone have any information about DES and IE. When use DES on the internet explorer version 6.0(SP1) which is not attached windows update, it does not view completely. However, when IE 6.0(SP1) which is updated with windows update, there is no problem. Or Using DES and 3DES, no problem too. What does DES relate with IE 6.0? Have you ever experienced such as situation?