system
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I did a really good search & tried everything I could find.
I got rid of Raxco PD11 'cos others had issues of some sort or other.
I got rid of Mil Shield 'cos it loaded with windows.
I swapped out my wireless card for another (exact same) 'cos there has always seemed to be a fight with Avast as to what loaded first & perhaps a hardware fault. Could still be those drivers I suppose.
But even if everything runs without any issues for a year I will not have proved anything.
I still have a year on my Avast AV pro license, so perhaps wait until another release or another BSOD without Avast - and then what?