How to Disable Internet Explorer in Windows Vistaby Aaron Wein
One of the main reasons users either uninstall or disable Internet Explorer from their computer is to prevent viruses from spreading. Windows Vista users have the option of simply disabling access to the browser, which removes all shortcuts and prevents the program from running. This is often the simplest way to avoid the threat of viruses, and it still leaves the program installed on your computer in case you need enable it in the future.
Open the control panel on your Windows Vista computer and select the "Add or Remove Programs" icon. This opens a new dialog window where you will have several more options.
Choose "Set Program Access and Defaults," which is located at the bottom-left corner of the resulting dialog window.
Click "Custom" from the list. Your computer may take a moment to load the programs list. Notice "Choose a Default Browser" is at the top of the list.
Choose a new default browser.
Remove the check next to "Enable Access..." This disables Internet Explorer.
Select "OK" to complete the process.