Norton Safety Monitor Says I Have Reached A 10 Computer Limit

Trying to install NSM on a rebuild desktop.  Goes all the way through install to Name This Computer and then I get a dialog box that says You have reached your computer limit!  Up to ten machines are allowed for each Norton Online Family account.  I have rebuild PCs in my household a few times and installed it each time so NSM thinks there are more than there really are.  I looked through the web page and help and cannot find a way to clean it up to the proper number.  Any help and specific direction are appreciated. Thanks