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A Microsoft Corporation digital signature indicates that a driver file is an original, unaltered system file that Microsoft has approved for use with Windows XP Professional. Windows XP Professional can warn users about installing unsigned drivers or prevent them from doing so. If a driver is not digitally signed, the user receives a message that requests confirmation to continue. Microsoft digitally signs all drivers included with the Windows XP Professional operating system CD. When downloading updated drivers from a manufacturer s Web page, always select drivers that are signed by Microsoft. Windows XP Professional provides the following tools to help you identify digitally signed files:

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Part VI:

The File Signature Verification tool (Sigverif.exe) detects signed files and allows you to do the following:

Figure 10-4. If you have more than one way of connecting to the Internet, choose the one you use most often, and if possible, choose the fastest connection.

View the certificates of signed files to verify that the file has not been tampered with after being digitally signed. Search for signed files in a specific location. Search for unsigned files in a specific location.

When you click the Advanced button, the Advanced File Signature Verification Settings dialog box provides additional configuration options on the Search and Logging tabs. Search You can specify file search options, such as whether to search all drivers or limit the scope of your search by using file name and folder criteria. Logging You can specify that search results be saved to a file, the log file name to use, and whether to overwrite or append the log file. You can also view the log file by clicking View Log. File Signature Verification writes information to systemroot\Sigverif.txt, a log that contains the following information about the scanned files:

Name Modification date Version number Signed status Location (name of catalog file)

13. From the Select Item and Add to List Below drop-down list, select MenuItem, and click the Add button. Change the control s properties using the values shown in Table 9-7. Property (Name) ForeColor Text

Your Computer Has Multiple Connections page appears. The wizard will ask you for the appropriate network connection. Select either Determine The Appropriate Connections For Me to allow Windows XP to automatically bridge the connections or select Let Me Choose The Connections To My Network if you want to bridge those connections. In this procedure, select the second option so you can see the bridging steps that Windows XP will attempt to perform for you automatically, and click Next.

Driver Signature Checking enables you to detect unsigned drivers before you install them. Using Control Panel, you can set verification levels for driver signature checking to ensure that Windows XP Professional inspects files for digital signatures whenever you install or update drivers.

Appendix C:

To enable Driver Signature Checking 1. In Control Panel, open System. 2. Click the Hardware tab, and then click Driver Signing. Table C-16 describes the three levels of file signature verification that appear in the Driver Signing Options box.

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Table C-16 Level Level 0 (Ignore) Level 1 (Warn) Level 2 (Block)

Description Disables digital signature checking. The message that identifies a digitally signed driver does not appear, and all drivers are installed even if they are unsigned. Determines whether the driver has passed WHQL testing. A message appears whenever a user tries to install a driver that fails the signature check. Blocks installation of a driver that fails the signature check. You are notified that Windows XP Professional cannot install the unsigned driver.

10 The Select The Connections To Bridge page appears, shown in Figure 10-5,

System Information enables you to view a list of signed drivers installed on your system. To view a list of signed drivers 1. In the Run dialog box, type msinfo32.exe. 2. Expand Software Environment, and then click Signed Drivers.

Driver Query (Driverquery.exe) is a command-line tool that displays information about drivers running on your computer. For more information about using Driver Query to view signing information for drivers, see Driver Query later in this appendix.

Device Manager enables you to verify that Microsoft Corporation has provided or digitally signed a driver for a specific device. To view driver signing information by using Device Manager 1. In the Run dialog box, type devmgmt.msc. 2. Expand a device category. (For this example, expand Floppy disk controllers.) 3. Double-click Standard floppy disk controller, and then click the Driver tab. 4. Verify that Driver Provider is listed as Microsoft (for Microsoft-provided drivers) or that Digital Signer mentions Microsoft WHQL (for manufacturer-provided drivers).