The driver is necessary for the functioning of the computer and automatically restored at reboot. It is is a driver for hard disks and SSDs; it is a product of Microsoft. As I stated before, earlier versions of Geany had no problem with it. I just tried Geany 1.37.1 again; it can open files without all these error messages, so the only explanation is, that the messages are caused by something that is changed in Geany 1.38.