Internet Explorer 10 consumer preview users can disable the automatic update using the option available as part of the Help menu.
Click the Help menu on Internet Explorer and select About Internet Explorer option from the menu list. If you do not see the menu bar then press Alt on the Keyboard.
The About Internet Explorer window displays the Version and Product ID information along with the option to enable or disable automatic update.
You can un mark the check box with label as Install new versions automatically to turn off installing the latest version of Internet Explorer 10.
It is not recommended to un check this value unless you have got some specific reason not to take the latest release.