Irql_gt_zero_at_system_service

Oh, I see.

Yes it is.
Attachment 50640

Please make a screenshots of the properties of this file and post it

Oh, I see.

Yes it is.
Attachment 50642

Attachment 50643

Attachment 50644

Attachment 50646

You are running Windows protection right?
Temporary disable the security, disable internet connection and try it again.

Exactly the same.

I am right in thinking that this program, should it ever run, is simply to update the MediaTek drivers?

If I use device manager and update the relevant driver, I get a message telling me that the correct driver is installed and that it is up-to-date.

Through device manager one in most cases gets that message.
Updating through device manager is for this not the way.

It is supposed to update a network driver yes, but because you have multiple it could be that this one isn't causing trouble.
I've only suggested it to minimize the causes, the dumps with NETIO.sys weren't exactly clear about network drivers.

As a further piece of information, this is the message I get when I try to view the certificate associated with the errant file:
Attachment 50716