The ClearUserTags method deletes all user tags
HRESULT ClearUserTags();Return values:
S_OK on success or COM error codeNV_NOT_INITIALIZED - Initialize was not calledNV_UNKNOWN_PROFILE - no profile loaded
HRESULT ClearUserTags();S_OK on success or COM error codeNV_NOT_INITIALIZED - Initialize was not calledNV_UNKNOWN_PROFILE - no profile loaded