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Safe mode is a diagnostic startup environment that runs only a subset of the drivers and services that are in your system memory. Safe mode is useful when you install software or a device driver that causes instability or problems with starting in normal mode. In most cases, safe mode allows you to start Windows XP Professional and then troubleshoot problems that prevent startup. Logging on to the computer in safe mode does not update the LastKnownGood control set. Therefore, if you log on to your computer in safe mode and then decide you want to try Last Known Good Configuration, the LastKnownGood control set is still available. In safe mode, Windows XP Professional uses the minimum set required to start the graphical user interface (GUI). The following registry subkeys list the drivers and services that start in safe mode:

Up to this point, the chapter has explored the configuration options provided to you through the Internet Options tabs. As you have seen, there are many customizable features and security options available to you. However, Internet Explorer can be customized in additional ways so that Internet Explorer is easy for you to use and makes your browsing experience more enjoyable. This section covers several categories of Internet Explorer settings and configuration options that aren t configured in the Internet Options dialog box. The more obvious settings are not covered to allow space for more advanced configuration features that you are likely to enjoy.

Part V:

To access safe mode 1. Remove all floppy disks and CDs from your computer, and restart your computer. 2. Press F8 when prompted. If Windows XP Professional starts without displaying the menu shown in Figure 29-4, restart your computer. Press F8 after the firmware POST process completes but before Windows XP Professional displays graphical output. 3. On the Windows Advanced Options menu, select Safe Mode, Safe Mode with Networking, or Safe Mode with Command Prompt. Select a safe mode option from the startup recovery menu that appears when Windows XP Professional detects that the startup attempt was unsuccessful. For more information about the startup recovery menu, see Restoring to the Last Known Good Configuration earlier in this chapter. For more information about safe mode, see Windows XP Professional Help and Support Center and Appendix C, Tools for Troubleshooting. Also see article 315222, A Description of Safe Mode Boot Options in Windows XP, in the Microsoft Knowledge Base. To find this article, see the Microsoft Knowledge Base link on the Web Resources page at http:// www.microsoft.com/windows/reskits/webresources.

When you update a device driver, your computer might have problems that it did not have with the previous version. For example, installing an unsigned device driver might cause the device to malfunction or cause resource conflicts with other installed hardware. Installing faulty drivers might cause Stop errors that prevent the operating system from starting in normal mode. Typically, Stop message text displays the file name of the driver that causes the error. Windows XP Professional provides a feature called Device Driver Roll Back, which can help you restore system stability by rolling back a driver update. Note Use System Information to determine whether a driver on your system is signed and to obtain other information about the driver, such as version, date, time, and manufacturer. This data, combined with information from the manufacturer s Web site, can help you decide whether to roll back or update a device driver.