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Windows XP Professional includes many features that help ensure that the device drivers installed on your computer are reliable and up to date. Drivers are signed by Microsoft after they pass a series of tests for reliability. Windows XP Professional checks for a digital signature whenever a driver is installed and issues a message if the driver is not signed. In addition, drivers that are known to cause problems in Windows are blocked from loading or installing, because Windows XP Professional checks a database of known problem drivers when the computer is started or when a device driver is loaded. If the driver is located in the database of known problem drivers, it cannot be installed or used on your computer. Another feature is Windows Update, a Web site where updated versions of signed drivers are available for download. These and other Windows XP Professional features for device drivers contribute to a stable computing environment and are discussed here in more detail. Device Manager provides details about device drivers on the device s Properties page. Click the Driver tab and select Driver Details to list all the drivers the device is using. Driver details displayed include whether the driver is signed, its version, and whether it has been blocked from loading. For more information about Device Manager, see Device Manager earlier in this chapter.

Microsoft uses a multistage process to test device drivers. Drivers are subjected to compatibility tests administered by the Windows Hardware Quality Lab (WHQL), and drivers that successfully complete the process are digitally signed. Because of this testing, signed drivers are typically more robust and reliable. Once a driver is digitally signed, Windows XP Professional recognizes it when it is loaded. Windows XP Professional notifies the user if a driver is not signed or if a driver file has been changed since its inclusion in the Windows Catalog, which contains an up-to-date list of hardware that is supported for Windows XP by Microsoft. Tip

appears, as shown here. You can choose to encrypt only the selected folder or its subfolders as well. Make a selection and click OK.

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The Windows Catalog at http://www.microsoft.com/windows/catalog replaces the older Hardware Compatibility List (HCL), but you can still access text-only versions of the HCL for different Windows versions from Windows Hardware and Driver Central at http:// winqual.microsoft.com/download.

The digital signature is associated with individual driver versions, and it certifies to users that the driver provided with the device is identical to the driver that was tested.

Part II:

share an encrypted file or folder so that others you specify can access it. This feature lets you encrypt the file or folder as well as make exceptions if other users on your computer need to access the file and you want to allow them to do so. To enable others to use the encrypted file, follow these steps:

The following three driver-signing policy settings in the operating system enforce signature verification and determine what the operating system does with an unsigned driver:

Warn Checks the signature on the driver before installation, and displays a warning if the signature verification fails. The driver can still be installed, although installation is not recommended. Block Checks the signature on the driver before installation, and blocks installation of the driver if the signature verification fails. Ignore Silently checks the signature on the driver, logs any unsigned driver files to a log file, and allows the installation of the driver.

1 Right-click the encrypted file and choose Properties. 2 On the General tab, click the Advanced button, and then click the Details

Note The computer displays the Warn dialog box if you try to replace a signed driver with an unsigned driver, even if the policy is set to Ignore.

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