DaveRo - I've done my best to disable all auto updates and tasks...

.. that I'm aware of and could find..

But possible there might always be tricky little system buggers lurking in the background...???

I'm as certain as I can be that no virus or malware is the cause,
I never install more than a few necessary programs on the 'Shopping' PC,
and try to exercise due caution on the 'dodgy' one...

I bought extra memory for both, and would hope this might help,
but I can't remember where I put the parcel after it was delivered...