I have recently installed Norton 360. When CCleaner does a registry scan the following problem is identified:
Data C:\Program Files\Common Files\Symantec Shared\NHelp\\NRTHelp.chm
Registry Key HKLM\Software\Microsoft\Windows\HTML Help
The register key value is:
C:\Program Files\Common Files\Symantec Shared\NHelp\
When CCleaner fixes the registry problem by deleting the registry key, Norton 360 "Help" does not work. When I restored the registry key, Norton 360 "Help" does work.
CCleaner should not identify this as a problem.