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Thanks for the suggestions Hornus.
Things have actually moved on a bit since… one blue screen proved fatal 
I did go your suggested route at one time, but there are SO many devices on this pc that it became impractical to disable them all and then test one at a time. Also, I’m not convinced that Windows is reporting the devices correctly as most of the information is read from the drivers that windows actually see’s fit to load.
Anyway, it’s a long, long story and I’ve paid my most favourite people in the whole world for support, and they are busy scratching their heads over the problem… good old Microsoft :o
>:(