Hello. How do you get rid of certain registries?
Assuming they appear in a CC registry scan... Right click on the list of entries and click Deselect all. Then select the entries you want to delete. Press Fix Selected Issues, say yes to Do you want to backup the registry, then say yes to the entries as they are presented to you.
If you want to remove a registry entry that isn't in CC's list then I suggest you read up what Google provides under registry editing. It can be daunting.