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Therefore, you may have to check the registry to verify that all entries are removed. Be aware that software installed by other methods may not be completely removed when the device is removed in Device Manager.

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Some manufacturers install the device by using the InstallShield installation program or a similar method.

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Software-only device drivers do not expose a device ID, and there is no standard method for installing these devices.

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Additionally, devices that bridge between bus types, such as a device driver that enables a parallel port device to emulate a SCSI or an AT Attachment Packet Interface (ATAPI) bus, are also known to generate an unknown-device response in Device Manager.įaulty Hardware or Firmware: Faulty hardware or firmware may cause a device to be displayed as Unknown Device in Device Manager. Note Software programs that require virtual hooks into hardware may create these devices. If a device ID is not present, or your Windows XP-based computer does not recognize the device ID, Device Manager may list the device as unknown. This identifier can include several different types, such as vendor ID, device ID, subsystem ID, subsystem vendor ID, or revision ID. Unrecognized Device ID: Every hardware device has a special identifier that is used by Plug and Play. This typically occurs when the device driver manufacturer does not correctly differentiate between the two drivers or assumes that Windows XP can use Windows 98 or Windows 95. If you try to install them on your Windows XP-based computer, the device may be listed as unknown in Device Manager. You are using a Microsoft Windows 98 or Microsoft Windows 95 Device Driver: You cannot use virtual device driver (.vxd) files that are common to Windows 98 or to Windows 95 drivers in Windows XP. If the bus cannot identify the device, it interprets the device as a composite device and then reports it as such in Device Manager. However, an additional device driver is needed if the device does not fit the defined and supplied Windows class drivers. Note Most USB and IEEE 1394 devices function correctly without additional device drivers because they are configured by the drivers that are included with Windows for these bus types.

Also, a status of Error Code 1 or Error Code 10 may be displayed when you view the properties of the device in Device Manager.

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This is very common with universal serial bus (USB) and Institute of Electrical and Electronics Engineering (IEEE) 1394 composite devices. The device does not have a device driver: When a device driver for a device is not available, Device Manager displays the device as Unknown Device and puts it in the Other devices branch. Causes of unknown devices in Device Manager

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For information about how to do this, visit the following Microsoft Web site: If you are not comfortable with advanced troubleshooting, you might want to ask someone for help or contact support. This section is intended for advanced computer users. Download and install the Windows XP version of the driver. Look for a Drivers section or a Download section on the manufacturer’s Web site, and search for the device name. Visit the Web site of the device manufacturer if the device was preinstalled on your computer and the computer manufacturer does not have an updated driver. Visit the Web site of the device manufacturer if the device was installed after you purchased your computer. Visit the Web site of the computer manufacturer if the device came with the computer.

When you download a driver from the Internet, download the Windows XP version of the driver when multiple Windows versions are listed. Method 2: Download and install the latest driver from the Internet Visit the following Microsoft Web site to see whether the Web site autodetects an updated driver for your device. Use the following methods to enable Windows to recognize your device. To fix this issue, obtain an updated driver for the device. The main reason for Unknown Device to display in your Device Manager is because you have a device that is not working correctly. This article discusses the possible reasons that an unknown device may appear in Device Manager.

It may be difficult to determine the cause of this unknown device, because there are few indications of what generates it. When you view device information in Device Manager, you may see a device listed as Unknown Device next to a yellow question mark. For a Microsoft Windows 2000 version of this article, see 244601.ĭevice Manager displays a list of all devices that are installed on a Windows XP-based computer.

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