Depending on how comfortable you feel with this, one other way to remove the driver would be to open USBDeview. Select a Linux File-Stor Gadget device, right click on it and select Open INF file. In the editor window, if the inf file name does not show as usbstor.inf, copy the filename. Still in USBDeview, uninstall any instances of mass storage devices. Open the Windows directory and do a search for that filename. Rename any instances to filename.inf.dnu. Reboot your computer.
To download USBDeview, see
USB Deview on Nirsoft's site. The download link for the 64 bit version is
https://www.nirsoft.net/utils/usbdeview-x64.zip