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Windows 7: Code 43 Unknown Device for USB connected Logitech C920 webcam

03 Aug 2014   #1
RetAC1USN

FL
 
 
Code 43 Unknown Device for USB connected Logitech C920 webcam

I have been using a logitech C920 webcam for months on this laptop. Yesterday, I plugged it in and got an unknown device message. I reloaded the logitech software from their site. No change. I plugged the webcam into another laptop and it was recognized. I have tried a basic "clearing" of the system by powering down, unplugging the power and removing the battery then holding the "power on" button for 2 min.

Still getting a unknown device no matter which usb port I plug the webcam into.

Any suggestions?


My System SpecsSystem Spec
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03 Aug 2014   #2
carwiz

Windows 7 Pro-x64
 
 

Did you try it in one of the other USB ports? Does a different device, such as a thumb drive, work in the USB ports?
My System SpecsSystem Spec
03 Aug 2014   #3
RetAC1USN

FL
 
 

Sorry .. should have included .. tried 2 flash drive 4G and 8G as well as a 500G portable HD .. all 3 devices were recognized and loaded without issue.
My System SpecsSystem Spec
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03 Aug 2014   #4
carwiz

Windows 7 Pro-x64
 
 

OK. Follow the tutorial link below to delete the driver InfoCache. Be sure to follow it step by step.

USB Driver - General Fix for Problems
My System SpecsSystem Spec
23 May 2015   #5
Randomrocket

Microsoft Windows 7 Professional 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

I have this same problem with the same webcam. I tried doing the tutorial on deleting the InfoCache file a few times until it worked. It worked briefly on skype and the camera video kept freezing every few moments. Whenever the video froze, all input devices would freeze also. If I tried typing something, nothing would be registered unless I was in the middle of a key press and then it would type a long string of letters.

Then I turned on my computer a few days later and the camera wasn't working. Device manager said the device could not start again. I have tried this camera on multiple different USB ports (both USB 2.0 and 3.0) and on different computers. It works perfectly fine as far as I can tell on my laptop, but not on my desktop. Is there some sort of unofficial camera driver or something i could use instead?

Any help?
My System SpecsSystem Spec
23 May 2015   #6
carwiz

Windows 7 Pro-x64
 
 

As noted in the tutorial, some NVIDIA graphics drivers may be causing the issue. If you recently updated the NVIDIA drivers, try rolling back to the previous version. I you haven't updated drivers for some time, check to make sure you have the most recent.

NVIDIA graphics drivers: Drivers - Download NVIDIA Drivers
My System SpecsSystem Spec
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