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Windows is removing this device. (Code 21)
http://www.vistaarticles.com/articles/486/1/Windows-is-removing-this-device.-%28Code-21%29
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Published on 11/16/2007
 
Windows is removing this device. (Code 21)

Windows is removing this device. (Code 21)
Wait several seconds, and then refresh the Device Manager view. If the device appears, restart the computer.