Hi satch59
The following instructions that CCleaner support gave me fixed that problem for me:
'This seems to be an issue with the recent Windows update.
As a work around can you try the following:
Open Explorer and go to c:\Program Files\
Right click on CCleaner folder, select Properties
Click on Security Tab, then Advanced button.
In the Advanced Security Settings window click on Change permissions button.
Check the box labeled, Replace all Child object permission entries with inheritable permission entries from this object.
Click Apply button
Then click OK button.'
Sent from my Nexus 6P using Tapatalk