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The information in the IsSigned column is useful for troubleshooting because a value of FALSE indicates that a driver has not been approved by Microsoft for use with Windows. For more information about Driver Query, click Tools in Help and Support Center. For more information about driver signing, see Driver Signing and Digital Signatures earlier in this appendix.

Settings page. Use the Back button to make any necessary changes. When you are sure the settings are correct, click Next.

To maintain operating system stability, Windows XP Professional implements the following mechanisms to ensure that software installation programs do not overwrite critical system files:

The Windows File Protection (WFP) service monitors changes to protected system files. When the WFP service detects that a protected system file has changed, it examines file signature information to determine whether the new file is the correct version. If the version is incorrect, the WFP service displays a message similar to the following:

A file replacement was attempted on the protected system file filename. To maintain system stability, the file has been restored to the correct Microsoft version. If problems occur with your application, please contact the application vendor for support.

network settings to other computers on the network. You do not need a network setup disk if all clients on your network are Windows XP clients. If all your computers are running Windows XP, select Just Finish The Wizard; I Don t Need To Run The Wizard On Other Computers. Although you will still need to manually launch the Network Setup Wizard on your other Windows XP clients, you don t need setup disks to do so.

The WFP service then records an entry to the System log and replaces the invalid file with a backup copy from the systemroot\System32\Dllcache folder. If a backup copy is not found in Dllcache, you are prompted to provide the Windows XP Professional operating system CD or a source file location.

Part VI:

Once the first network client is configured, which should be the ICS host on a system that shares a single Internet connection, you should then run the Network Setup Wizard on the other Windows XP network clients. If you are using ICS, keep in mind that the Network Setup Wizard will ask you to choose how the computer connects to the Internet (see step 6 in the preceding section). Select the This Computer Connects To The Internet Through Another Computer On My Network Or Through A Residential Gateway option, as shown in Figure 10-3, page 295. The Network Setup Wizard will locate the ICS host and proceed with the setup. Remember too that if you need to use a network bridge, the bridge does not have to be located on the ICS host. In fact, several of your Windows XP clients can potentially function as bridges. As long as the computers have two or more NICs installed, the option appears when running the wizard, as described in steps 9 and 10.

System File Checker (Sfc.exe) is a command-line tool that examines protected system files on your computer and restores the correct versions by using backups stored in the Dllcache folder or files copied from the operating system CD. Protected files include those with .sys, .dll, .exe, .ttf, .fon, and .ocx file-name extensions. Because of disk space considerations, storing all protected files in the Dllcache folder might not be practical, especially on computers with limited storage space. Therefore, you must be ready to provide the Windows XP Professional operating system CD when prompted to do so. You can use System File Checker to repopulate the Dllcache folder if the contents become damaged or unusable. To purge and repopulate the contents of the Dllcache folder, in the Run dialog box, type sfc /purgecache You can also specify the protected file cache size by using the following syntax: sfc /cachesize=x The value of x represents the number of megabytes (MB) of space to use in hexadecimal notation. For example, to specify 200 MB, type sfc /cachesize=C8 Note