Open Internet Explorer then Tools/Internet Options/Advanced tab and under "Browsing" take the checkmark out of "Automatically check for Internet Explorer Updates", click "Apply", click "OK".
Next Start/Programs/Accessories/System Tools/System Information and under the "Tools" tab click "System Configuration Utility" click the "Startup" tab and uncheck "Critical Update" click "Apply", click "OK" and restart your computer. (NOTE: This item only applies if you have the "Critical Update" program installed). Hope this helps.
And my tuppence worth - in control panel there should be an applet to enable or disable automatic updating...
Never, ever approach a computer saying or even thinking "I will just do this quickly."
If it's the one you got at Windows Update site 'Critical Update Notification' (CUN), you should have that listed in Add/Remove Programs so that you can un-install it there.
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