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?

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.

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?