Laptop with XP Home SP3

Using CCleaner to check registry I'm left with this key:-

HKEY_CLASSES_ROOT\{80b8c23c-16e0-4cd8-bbc3-cecec9a78b79}

CCleaner cannot remove it. I've also tried RegAssasin (1.03) available
from Malwarebytes and that product cannot remove the key either.

Any clues as to why I cannot delete this key?

--
Dave