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If Windows won t start normally, you may be able to reach the desktop by using one of three Safe Mode options available at startup. From Safe Mode, you can start and stop services, change computer settings, uninstall a program or driver that you suspect is causing your problems, or use the System Restore utility to roll back your configuration. Veterans of Windows NT and Windows 2000 should be familiar with this option, which is available from the Advanced Options menu or by pressing F8 at startup. It lets you quickly reverse changes made to the CurrentControlSet registry key (which defines hardware and driver settings) since you last successfully started Windows. This system recovery tool, a greatly improved version of a utility that debuted in Windows Me, is the next best thing to a time machine. At regular intervals, the System Restore utility takes a snapshot of your system files and settings, monitoring every change and storing compressed copies of original files in a protected location. If you can start Windows normally or in Safe Mode you may be able to use System Restore to undo the configuration change that s causing the problem. If you re unable to boot into Safe Mode, this self-contained command-line environment is your last best hope. Start from the Windows CD and choose the Repair option to launch the Recovery Console. From the command line, you may be able to replace a corrupted file, delete a misbehaving driver file, or stop a service that s interfering with startup. When all else fails, you may be able to repair serious problems by reinstalling Windows XP over your existing installation. With the right preparation (and a little luck), you can repair system files without disturbing your settings and preferences.

In a recent engagement, I visited with a company that provides access from the Internet for its employees. The company uses an Internet connection to access company resources, including an e-mail server, file servers, and a product database. An Active Directory domain manages authentication. When the company decided there was a need to control Internet access to its intranet, it added a firewall. However, doing that resulted in users outside the firewall not being able to authenticate. What was the company s immediate solution Take out the firewall. Eventually, the company added the firewall back and added a virtual private network (VPN). Now all employees use the VPN to tunnel through the firewall and access corporate resources. The same solution could have been arrived at initially with a little bit of study, and the lost productivity and potential risk from harm would have been avoided.

Recovering After a Computer Crash Note A terrific tool for tracking down the cause of some sporadic, unexplained crashes is Driver Verifier Manager, which checks each device driver to verify that it conforms to Windows standards. (Faulty drivers are responsible for many computer crashes.) For information about Driver Verifier Manager, see the Troubleshooting tip on page 154. You can find further details online at http://www.microsoft.com/whdc/devtools/tools/verifier.mspx. The topics in this chapter all deal with operating system crashes problems that cause the entire system to become unusable or, at the very least, unstable. Fortunately, such crashes are rare. A more likely occurrence in Windows is an application crash, in which a particular application locks up. Before reviewing techniques for coping with operating system crashes, we ll survey the messages that Windows displays in response to application crashes and your options for reporting such crashes to Microsoft.

3

If you ve ever had to resort to terminating an unresponsive (hung) application with Windows Task Manager, or if you ve ever had an application roll over and die without apparent provocation on your part, you ve probably seen a request, similar to the one shown in Figure 32-1, that you send information to Microsoft This entreaty comes from Windows Error Reporting, a fault-response component built into Windows XP and enabled by default Windows Error Reporting, which replaces the Dr Watson module that was a staple of earlier Windows versions (the doctor has retired but still consults on request; see What Happened to Dr Watson , page 1128), serves two purposes First, it provides information to Microsoft that might help the company improve its product line.