I'm still not seeing it.. it's possible I'm crazy though (or they're only showing to registered or admin users. Either way, we may be able to help. Are you talking about the K2 comments, or something else? If it's the K2 comments, I think the master switch can be found if you go into K2 in the admin area and click the Parameters button in the top right. Buried in the long list of settings, you can disable Comments.
If those aren't the comments your seeing, let me know what the 'old' comments are, and we'll do what we can to help you rid yourself of them

Alex