This is the #1 complaint for the DT100 G2. It does not mean the driver is missing. It means the USB controller could not communicate with the device.
https://www.kingston.com/en/support
Imagine this: You plug a USB drive into your computer. It doesn’t show up. Or maybe it shows up as an “Unknown Device” with a yellow exclamation mark. You dive into the Device Manager, navigate to the hardware IDs, and see a cryptic string: USB\VID_0951&PID_1666 . usb device id vid 0951 pid 1666 link
Bookmark this guide, copy down the official Kingston URL, and never let an unknown USB error slow you down again. This is the #1 complaint for the DT100 G2