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To view information about the device driver

This information helps determine the file version of the device driver. An icon appears next to device drivers that are digitally signed.

Windows device drivers and operating system files have been digitally signed by Microsoft to ensure their quality. A Microsoft digital signature is an assurance that a particular file is from that manufacturer, and that the file has not been altered or overwritten by another program's installation process.

Depending on how your computer is configured, Windows either ignores device drivers that are not digitally signed, displays a warning when it detects device drivers that are not digitally signed (the default behavior), or prevents you from installing device drivers without digital signatures.

Views and characteristics

The views and their characteristics are available in the following options with descriptions:

• Devices by Typedisplays devices by the type of device installed, such as Monitor or Mouse. The connection name is listed below the type.
• Devices by Connectiondisplays devices by how they are connected in your computer. Each device is listed under the hardware to which it is connected. For example, if a small computer system interface (SCSI) card is listed, the devices attached to the SCSI card will be listed beneath it.
• Resources by Typedisplays the status of all allocated resources by the type of device using these resources. The resources are direct memory access (DMA), channels, input/output ports (I/O ports), interrupt request (IRQ), and memory addresses.
• Resources by Connectiondisplays the status of all allocated resources by connection type. The resources are: DMA channels, I/O ports, IRQ, and memory addresses.
• Show Hidden Devicesincludes non-Plug and Play devices (devices with earlier Windows device drivers).

Updating or changing a device driver

Ensure the latest device driver for each of the devices is loaded in Windows XP. Manufacturers frequently update their drivers to fix problems and take advantage of operating system features. These drivers are usually available from the manufacturer's Web site, and Microsoft also maintains driver files for many devices on its Web sites.

Upon downloading drivers, read the manufacturer's instructions before attempting to use the files to update the device. Often, downloaded driver files are compressed into a self-executing file that needs to be extracted in order to use the driver. In the Hardware Update Wizard, click to select theÁÕ´ÔÊ¡ìoption, then click theàÃÕ¡´Ùbutton to locate the driver files.

How to install a new driver from Device Manager

1. Double-click the type of device you want to update or change.
2. Right-click the specific device driver you want to update or change.
3. ¤ÅÔ¡¡ÒûÃѺ»Ãاâ»Ãá¡ÃÁ¤Çº¤ØÁto open the Hardware Update Wizard. Follow the wizard instructions.

Rolling back to a previous version of a driver

Use this feature if you encounter problems after you install a driver, such as error messages when you access the device, faulty behavior of the device, or even the inability to start Windows.

Windows XP provides this roll back to a previous, working, device driver:

1. Right-click the device for which the previous version of the driver is desired and then click¤Ø³ÊÁºÑµÔ.
2. ¤ÅÔ¡¡ÒÃDriversá·çº
3. ¤ÅÔ¡Roll Back Driver.

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If the status is Disabled, that is usually the result of user action, and does not necessarily mean that the device has a problem. However, sometimes users disable a device because it was causing a problem, and you should try enabling it to see if it impacts another device negatively.

If the device is experiencing a problem, the Device Status box displays the type of problem. You may see a problem code, or number (or both) and a suggested solution. If you call a support line, this number can be useful for determining and diagnosing the problem.

Troubleshooting a device requires steps specific to that device. If the Device Status box displays a problem, clická¡éä¢to launch the Windows XP troubleshooter for this device type. Supply information and answer questions as prompted.

If you cannot resolve the problem with the troubleshooter, contact the manufacturer.

For help with device problems in Windows Vista, visit the following Microsoft web page:

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