Although Microsoft has recommended consumers turn on Windows' Automatic Update feature to get Windows XP Service Pack 2, PC makers are reminding Windows XP users to do their homework before installing the security update.

Major computer makers recommend consumers install the update, but in many cases they also have a list of revised drivers and other software patches that should be installed before downloading and installing the operating system update.

For example, Dell notes that owners of Inspiron 9100 or XPS laptops with certain ATI graphics cards should update their drivers, as should those with an internal Bluetooth wireless card.

Hewlett-Packard has a list of updates on its Web site that consumers should check before installing the update. In particular, many components of the company's Media Center products should be updated, including the driver for the wireless keyboard and the software for the program guide. Sony, too, has posted a tool on its Web site to let customers determine what, if any, updates should be made prior to installing Service Pack 2.

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