Registry Mechanic Licens When I Scan My PC With Registry Mechanic, I Keep Getting A Strange Message. Can Anyone Help?

When I scan my PC with Registry Mechanic, I keep getting a strange message. Can anyone help? - registry mechanic licens

I am not technically minded, so I use Registry Mechanic to clean up my PC.
When the Registry Mechanic has completed its investigation, often a message appears that there is a problem with my PC configured as follows: --

High Priority: Value is not valid
City: - HKEY_CLASSES_ROOT \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ ZAMailSafezdefaulticon

Can someone explain? And I must be anxious to see this message more than once - or it can be ignored?