XP.
http://pcsupport.about.com/od/browsers/f/removeiexp.htm
Windows 7.
http://lifehacker.com/5164286/windows-7-lets-you-finally-uninstall-internet-explorer-kinda
http://pcsupport.about.com/od/browsers/f/removeiexp.htm
Quote
Unfortunately, there is no safe method to remove Internet Explorer from Windows XP.
Internet Explorer is more than just a browser. It works as an underlying technology behind a number of internal Windows XP processes including updating, basic Windows functionality and more.
There are methods outlined on some other websites that appear to completely uninstall Internet Explorer and provide workarounds for the problems that removing it causes, but I don't recommend them.
In my experience, removing IE causes too many problems to be worth it, even with the workarounds.
Windows 7.
http://lifehacker.com/5164286/windows-7-lets-you-finally-uninstall-internet-explorer-kinda
Quote
Since Internet Explorer's rendering engine is also used throughout Windows and with third-party applications as an embeddable component, it won't completely uninstall—only the executable is actually removed.












...this is no longer considered a preview. Featureless Opera is officially released.