Unknown device: Windows has stopped this device because it has reported problems (Code 43).

Anonymous

I have Windows 7 Ultimate. Since very recently an unknown device keeps popping up in the device manager every time I start Win. It's reported location is within the front USB root hub but I haven't changed there anything lately. The device status reports "Windows has stopped this device because it has reported problems (Code 43)". I can uninstall/disable it but it will get picked up again the next time I reboot. All other usb devices (mouse, keyboard, web camera, APC UPS, external drive, printer) work fine. How do I get rid of this nuisance so that it doesn't reappear?

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Anonymous

If the problem coincided with hooking up the APC UPS that may indicate the problem is with the UPS.

Somewhat similar situation discussed in the following link:

http://www.velocityreviews.com/forums/t527369-apc-ups-usb-as-unknown-device.html

Your situations seems similar as from the "System Information" file the "problem device" has an Error Code "This device is working properly" yet remains an "Unknown Device".

I would suggest to detach the APC UPS from the computer and uninstall any related software.

Restart the computer and see if the "Unknown Device" problem resolves.

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53 additional answers

Anonymous

2013-03-25T21:55:33+00:00

I also had this problem and discovered, after trying just about everything else, that it was the hinge on my laptop. If I moved the screen while the computer was running, the error code 43, unknown device came up. Sometimes, it would cause the computer to crash. So now I keep the laptop open (as much as possible) and hibernate it when I'm not using it.
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