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Thanks so much guys,
After examining the details outlined in your responses, I was able to identify a ‘Add on’ in Chrome for ‘Smileys emoticons’
On this basis I believe I may’ve found the source of the mysterious reinfections.
The symptoms have been serious enough to make browsing impossible. The smileys we love banners cover images on web sites making browsing completely useless on most sites. It’s far from a ‘Possible’ unwanted program, and is insidious.
Sadly the fixes outlined would take almost as long as the reloading of software from scratch… I just have to bite the bullet and make a new image from scratch, so I have a nice fresh image to roll back to in the future, should I require it 