Thank you Dalchina for that invaluable info .....I assume I would only do a clean boot if I am experiencing problems at startup and that link takes me right to the finish . One thing that puzzles...

Thanks for the reply Dalchina , very much appreciated . Some of what you have suggested I have never tried before , especially Disk imaging . Settings should be all default as I am certain I haven't...

Lately , Cortana has been been MIA and I have seen nothing as to what is happening or how to fix it . Inexplicably today it has reappeared and all systems seem normal . Just the fact that Cortana is...