If you are using Firefox or Chrome and never use Internet Explore 8 ( IE 8 ) ,you can follow the below steps to uninstall IE 8 from your windows 7.
1.Go to Control Panel (small icons view) then click Programs and Features
2.In the left Pane,click Turn Windows Features on or off
3.Clear the check box of Internet Explorer 8 .Click Yes when a warning window prompted
4.The system will take a while to remove IE 8 from your windows 7 and you need a reboot to enable this uninstallation.