Thanks All, I simply had to uninstall WINRAR as per the advice here.
Cheers again, Rod

Hi All,
I will try everything suggested here and let you know how I go.
Thanks to all of you who tried to help, I really appreciate it.
Cheers,
Rod

Howdy,
I have a Windows 10 laptop that has been working fine since being upgraded from Win7 about 6 months ago.
I switched it on yesterday, no problems encountered, until I opened File Explorer...