Thanks, Michael.

Unfortunately I've still got the problem.

I uninstalled the graphics card driver and the installed one dated December 2015.
Still got crashes.

I renamed the moi.ini file moi.ini.old and replaced it with Chipp Walter's moi.ini file.
Still crashing.

I've searched all drives with the excellent Everything search program (Void Tools) - no sign of moi_report*.*

As you seem pretty sure that it's likely to do with the graphics card it might be worth trying uninstalling the graphic drivers again and running for a while without the card at all?
On the other hand it's only Moi that's crashing...

What do you think?

Mike.