I found this in a few different places around the 'net - hopefully it's helpful:
How to Turn On Automatic Updates
- Click Start , click Control Panel , and then double-click System.
- Click the Automatic Updates tab, and then click one of the following options:
- Download the updates automatically and notify me when they are ready to be installed. (This is the default setting.)
- Notify me before downloading any updates and notify me again before installing them on my computer.