After the reboot, the previous version of IE installed on your system will be restored.When the IE9 uninstallation is completed, restart your computer.Follow the on-screen instructions to uninstall Internet Explorer 9. When Uninstall an update dialog box appears, click Yes.Find Windows Internet Explorer 9 from the list of installed updates, right-click it and then select the Uninstall option.From the left pane, click View installed updates.Go to Start -> Control Panel -> Programs and Features (or Uninstall a program link).Please backup everything you care of such as your bookmarks, history, etc before trying anything, and please do this at your own risk. The same can be applied in any later or older Windows OS. The below example was for IE9 reverting to IE8 in Windows 7.
How to Uninstall Internet Explorer and Downgrade to older IE such as IE10/9/8 In most cases, even if the IE cannot be downgraded, it will reinstall back automatically via Windows Update. While we do not guarantee that this will work for your current IE and Windows version, please proceed at your own risk. Well, if you’re on older Windows OS such as Windows 7 and have accidentally updated your Internet Explorer via Windows Update, you can downgrade or revert it to an older version by following the steps below. For example, IE11 will be preinstalled in Windows 8 or 8.1, in which case you can’t downgrade such version of IE as doing so will only repeat with the same installation of the same version of IE.
The version of IE will be corresponding with the version of Windows OS. By default, Internet Explorer will be installed along with your Windows OS.