Many thanks for the suggestion - tried and failed. This seems like a "deep" Windows problem

I use Bullguard but not for backup. This was a bog-standard Windows backup from my SSD to a partition on my HDD.

My computer delivers a BSOD and reboots when I get to about 95% through a Windows backup. The error message points to VHDMP.SYS.
It's actually failed intermittently for some weeks and then backed-up...