CCleaner Free: When adressing the "Registry" section to the lower part on the left side there is the "Nach Fehler suchen" switch. "Fehler" is the singular. Correct would be "Fehlern" (Plural). Which adresses in correct German the standard search result, being the discovery of more than just one "Fehler". Even more tricky - in this particular case "Fehlern" even correctly adresses the finding of just one "Fehler".
oh yes,
scan for issue --> nach Fehler suchen
scan for issues --> nach Fehlern suchen