Microsoft to push Internet Explorer 8 through automatic update
The update should start showing up the third week of April for Windows users running Windows XP, Vista, or Windows Server 2003 or 2008. Microsoft is planning a phased rollout, so you might not get the update right away. Of course, you can always just download and install the browser yourself if you don't feel like waiting.
But what if you don't want the new browser? First, IE8 will automatically be downloaded through Windows Update, but it won't automatically install itself on your system. You'll see a prompt asking if you want to install the browser.
You can also install a blocker tool that will prevent Windows from automatically downloading Internet Explorer 8 if you want to hold off on installing the browser indefinitely.