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Understanding Device Installation and Management CHapTER 17
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The default setting for this value is 0x2000ffff . For information on how to configure logging levels for the SetupAPI logs, see the white paper, Debugging Device Installation in Windows Vista, found at http://www.microsoft.com/whdc/driver/install/diagnose.mspx .
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Using Driver INF Files
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WRP protects the integrity of system files and system registry settings, including device drivers and device settings . Drivers are added to the list of WRP-protected files on the system only if they have been specifically flagged for protection by WRP when being staged to the driver store . When a driver package has been specifically flagged for WRP protection and that driver package is staged to the driver store, an event is logged to the event logs to indicate this . To verify that a third-party driver you plan to install will be protected using WRP, open the INF file for the driver and look for Pnplockdown=1 in the [Version] section . Microsoft recommends that ISVs who develop third-party drivers for Windows 7 include this setting (called the lockdown flag) in their INF files, which causes WRP to prevent users with administrative privileges from deleting or modifying the driver files referenced in the INF file . However, this is only a recommendation; ISVs are not required to include this setting in case compatibility issues should arise .
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Using Device Manager Error Codes
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Device Manager error codes are the codes that accompany icons displayed with exclamation points (also known as bangs) in the Device Manager console (Devmgmt .msc) . To view these error codes, open the properties of the problem device in Device Manager and look under Device Status on the General tab . You can view the hardware ID of the problem device by selecting Hardware Ids from the Property list box on the Details tab . When you parse SetupAPI logs, this ID can be useful for gaining further understanding of why the device did not install or is not working properly . Windows 7 reports the same Device Manager error codes as previous versions of Windows . Knowledge Base article 245386, found at http://support.microsoft.com/kb/245386, documents these codes, explaining the meaning of each and the kinds of scenarios that can cause them to be reported .
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During a device installation, if a user is prompted to install the device in the future
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and responds by choosing No, a driver must still be installed. Otherwise, the pnp service will continue to redetect the driver and prompt for installation. In this scenario, the Null driver (which actually means that the device is configured not to use a driver) is installed and Device Manager displays error code 28. If the user later wants to install the device, the user must select the Update Driver option in Device Manager because the device previously was assigned an error code because it could not be installed with any driver.
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Managing Devices and Services
Device Manager error codes are reported only during device installation; they are never reported during driver staging . This means that if a Device Manager error code is reported, the problem occurred during device installation and not driver staging . A good place to start troubleshooting is looking at how physical installation of the device occurred and whether it was done properly . Device Manager error codes are also reported in the SetupAPI .dev .log file . See the section titled Using the SetupAPI Log File earlier in this chapter for more information .
Using Driver Verifier
Another device driver troubleshooting tool is Driver Verifier, which can monitor kernel-mode drivers and graphics drivers and detect illegal function calls or other actions that could corrupt the system . Driver Verifier can subject drivers to a variety of stresses to uncover improper driver behavior . The Driver Verifier Manager tool (Verifier .exe) is located in %WinDir%\System32 and can be run either graphically (press Windows Logo Key+R, type verifier, and press Enter) or from an elevated command prompt using various parameters (type verifier / to learn more about these parameters) .
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