Thanks for your replies. I have also looked at that older thread that Repos referred to.
I guess I will back up the important stuff again - family piccies, emails that we have to keep, music, and so on, and get my local techie to do the necessary.
I think I will use a "pro" as over the years, this 1tb pc seems to have accumulated lots of crap. I wish I had a magic wand, but some of it will have been me stupidly copying stuff. He can clean it up while installing 10!!
Thanks
AO