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When was the last virus check performed Does the virus scanning software incorporate the latest virus signature updates For more information about virus signature versions and updates, see the documentation provided with your antivirus software. If a Service Pack is installed, is it the latest version

interface cards (NICs) used to communicate on your local network must not be firewalled. If they are, computers on the network will not be able to access your computer because the ICF table will not allow any network traffic to enter the computer that is not explicitly requested by you. ICF is used on the Internet connection only, not on the internal network connections.

If similar computers in your organization are problem free when you are troubleshooting a problem, you can use those problem-free computers as a reference for your root-cause analysis. The properly functioning system can provide valuable baseline data. By comparing the following elements, you can speed up the process of identifying contributing causes. Installed services and applications Generate a list of applications and services installed on the baseline computer to compare with applications and services on the problem system. To gather a list of applications installed on your system, use Add or Remove Programs in Control Panel. To gather a list of services enabled on your system, use Services (Services.msc) or System Information. For more information about using Add or Remove Programs, Services, and System Information, see Windows XP Professional Help and Support Center. Also, see Appendix C, Tools for Troubleshooting, and 29, Troubleshooting the Startup Process. Tip Service Pack 2 for Windows XP adds a Show Updates check box to Add or Remove Programs that lets you toggle between displaying or hiding installed updates such as security updates downloaded from the Windows Update Web site.

Software revisions Check the application and driver revisions to see whether differences exist between the two systems. Update the problem system s software to match the versions used on the problem-free system. For applications, you can usually find version information by clicking Help and then clicking About application name. For drivers, you can use Device Manager or System Information to find version information. For more information about determining device driver versions, see 9, Managing Devices. System logs Compare Event Viewer logs for problem indications such as signs of hardware stress. For example, unexpected system shutdowns are logged with a 1076 event identification number in the System event log. The associated descriptive text can provide essential information to diagnose the problem. Baseline and problem systems might have similar problems, but the symptoms are more noticeable on one computer because it performs a unique or very demanding role. For example, a server that provides multimedia content typically

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consumes more system resources than a server that stores infrequently used Microsoft Word documents. Problems with disk, audio, video, or network devices and drivers typically appear earlier on computers that are stressed. Additionally, logging options for most Windows XP Professional components exist, and these can help you with features such as authentication, security, and remote access. Hardware revisions A minor hardware component upgrade might not be significant enough to cause a manufacturer to change a product model number. Consider the following hypothetical scenario: A computer company uses a revision 1.0 motherboard when assembling a Model ZZXZ1234 computer. When reordering components, the company receives notice from the original equipment manufacturer (OEM) that it plans to correct certain problems by substituting updated revision 1.1 motherboards. The computer company then incorporates the updated components into all Model ZZXZ1234 computers. These minor changes might require you to exercise more care when updating drivers or firmware in your Model ZZXZ1234 computers. For example, a support Web page for Model ZZXZ1234 computers might post specific firmware versions, such as V3.0 for revision 1.0 motherboards and V4.0 for revision 1.1 and higher motherboards. Using firmware version V4.0 for computers that use revision 1.0 motherboards might cause problems.