We have a process outlined here, on how to delete PCs from your Hamachi network: https://help.logmein.com/articles/en_US/FAQ/How-do-I-delete-clients-from-a-network-or-an-account-en1
Additional documentation on the subject can be found here: https://help.logmein.com/articles/en_US/Documentation/hamachi-hamachi-central-about/?l=en_US&fs=RelatedArticle