Sometimes it is also necessary to remove all the ghost "USB Mass Storage Devices" and "USB composite devices".
You could also replace the netmd760.cat file with the one I posted here, and then install the driver. That would give you a signed driver for windows 10 64:
http://forums.sonyinsider.com/files/file/142-netmd-driver-64-bit-win7-or-vista/?page=3&tab=comments#comment-258