One of the most touted features of Internet Explorer is its ability to automatically download and install updates. However, if you want to keep your old Internet Explorer, there is an easy way to disable the automatic update function and prevent those annoying "Do you want to update?" prompts.
Download the toolkit that will block the installation of the next (not latest) version of Internet Explorer (see Resources for links). For example, if you are using Internet Explorer 6, then you can download the toolkit to disable Internet Explorer 7. This will disable any future versions from downloading, as well as the current version.
Left-click on the icon on the desktop and select "Run" from the submenu. A new window will pop up.
Scroll all the way to the bottom of the end-user license agreement and then click on the empty box to accept it. Then press the "OK" button. The toolkit will extract itself automatically. Restart the computer for the changes to take effect.