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There are many reasons that a Device Manager will list a device asunknown and hence, there is no foolproof way to troubleshoot theerror. Some of the causes for Unknown Device error are:

The hardware does not have the requisite software drivers, andWindows is not able to determine the device type
The driver is not compatible with the [...]

Code 21
Code Meaning: The device is being removed as it has a problem, and Windows needs to be restarted.

Recommended Resolution: Wait a few seconds and refresh the Device Manager. If the device still shows, then restart the computer.

Code 22

Code Meaning: The device has either been disabled by a user or has not started.
Recommended Resolution: Wait [...]

Code 16
Code Meaning: The device is only partially configured and Windows could not find all the resources required by this device.
Recommended Resolution: Run msinfo32.exe to get more information on the conflict. Check the Resources tab to get details of the conflict. Refer to the hardware documentation and/or the manufacturer’s Web site for instructions on the [...]

Code 11
Code Meaning: (Not applicable to Windows XP) Windows stopped responding when it tried to start the device, and hence will never try to start this device again.
Recommended Resolution: Run the Update Driver Wizard and reinstall with an updated driver from the manufacturer.

Code 12
Code Meaning: Two devices have been assigned the same I/O port, interrupt [...]

Code 6
Code Meaning: (Not applicable to Windows XP) Another device is using a resource that this device needs.
Recommended Resolution: Run msinfo32.exe to get more information on the conflict. Check the Resources tab to get details of the conflict. Refer to the hardware documentation and/or the manufacturer’s Web site for instructions on the correct values that [...]

Device Manager Error CodesAdditionally, a problem code explaining the problem is displayed for the device. The next step is to understand what each of these error codes mean and apply the recommended resolution. The list of problem codes and the recommended resolution are as follows:
Code 1Code Meaning: The device is not configured correctly.
Recommended Resolution: The [...]

The Device Manager utility provides a graphical view of all the hardware installed on the computer along with their associated device drivers and resources. It also acts as a central point to change any hardware settings and update associated device drivers. To access Device Manager on Windows 9x/ME, right-click My Computer and select Properties. Select [...]

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The Device Manager utility provides a graphical view of all the hardware installed on the computer along with their associated device drivers and resources. It also acts as a central point to change any hardware settings and update associated device drivers. To access Device Manager on Windows 9x/ME, right-click My Computer and select Properties. Select [...]