Thank you Harsha
I had tried this fix, but without the clean boot, so I followed the procedure above but the troubleshooter cannot detect the problem. As I said before, I had already uninstalled all the Office programmes, so I don't know how this "Office 15 Click-to-Run
Extensibility Component" exists or where it is on my computer
I tried installing Office 2016 in clean mode, but it couldn't find the installer. After re-starting in Normal mode, Office 2016 will still not install, and the same error message appears.
I have re-installed Office Home and Student 2010 successfully to enable me to keep working!
What do I do next, please?