The first suggestion I would make is to un install and reinstall your Internet Explorer 5.0. There may have been a problem setting up your Java virtual machine during the installation of Internet Explorer. You should go to the control panel and use the "add/remove programs" to un install IE5. You should double click a file called ie5setup.exe on your Mathcad 2000 cd which will install Internet Explorer for you. If you continue having problems please contact our technical support and we will investigate this problem further.