operating system, then the steps necessary will vary, but you need to setup the computer to dial the appropriate code and a comma before it dials the number. familyinternet.about.com nkd mballard How do I reinstall DUN? Using Windows 95/98/98SE Uninstallation: 1. Double-click My Computer on your desktop. You should see an icon that says Control Panel. 2. Double-click Control Panel. 3. Double-click Add/Remove Programs. 4. Click the Windows Setup tab. 5.