yes this is the exact message I got. However, when I installed the DeskView application, in the progress dialog I saw that, among the Others, it installed also the GABI driver for BIOS, so I suppose it's not missing. Also, in the device manager I have no "unknown devices", so it seems like all the drivers are in place.
In the BIOS the serial number is shown as "Not Present". It was one of the first things I checked when I had the motherboard replaced. However, it was never an issue since the BIOS v1.20 was the last stable version for many years. I looked at the DeskUpdate manual and it only refers to a "Custom" serial number (that is, I suppose, like an internal ID for corporate PCs). I wonder if there's also a function for flashing the machine's serial number.