VirtIO Drivers digital sign problem


I’m Enrico, a Windows Developer.
I’m creating an installer for VirtIO drivers with dpinst.exe.

Using old virtio drivers (0-1-52) I see this warning:

With new virtio drivers (0-1-63 and later) I see this other:

I tested a “cross sign” of the drivers with my company certificate:

but the warning is the same.

I think the first warning is better :wink:
What is it changed on virtio driver signing process?
What should I do?