Eddard, thanks for relying. I tried your suggestions but alas no go. Please see the screen shot. Mike, I don't really want to download any more programmes, I would rather use Windows10 to do the job. I downloaded a "Free" Spy Hunter programme, just to have a looksee and have had a devil of a job getting rid of it and I am not sure it's gone yet. I had to go into REGEDIT and search out all the dross left behind. Once bitten three time shy.
Thank you one and all, job done. Much appreciated. Whilst fiddling I discovered another way. Settings>Systems and Security>Find a Setting (in the box top right) >type in Admin Tools and there it is, third one down.
Something else I have learned and have written down in case I forget. At 83 one does forget things you know.
Thanks kemical. Tell me please, is Optimising the same as defragging? I did an Analyze and then Optimise. I wondered if that is the same as defragging. Normally that takes about an hour to complete. Is there an additional setting to be found?
I experienced the same thing as well; that is, the built-in defrag sometimes doesn't do a good job, even for data drives. For example, I have one HD used to copy large video files, burn them to DVDs, then delete them. At some point, verification errors show up in the DVDs after burning, and they still show up even after I use another set of blank disks or optimize the HD and boot the system several times. It's only when I use a third-party defrag program on the HD does the problem go away.