On my mac, in activity process, there are two processes that keep on running even though I stop them. They are AddressBookSourceSync and com.apple.AddressBook.ContactsAccountsService. Is it possible that they are viruses or am I just being paranoid. How do I quit these? I tried everything but it keeps turning back on.
Taken from one of the answers in this Apple Communities thread:
Export all contacts to a vCard file for safe keeping.
Delete Library --> Application Support --> Address Book.
Open System Preferences --> iCloud. Enable Contact Syncing.