You want to remove unused personalities from the NS 7.1 to save disk space. Follow these steps:
Go into the Symantec Management Console under Manage | All Resources | All Resources | Software Component | Personality Resource.
Locate the personality you want to remove, right click and properties. Note the location folder and GUID.
Open the folder indicated, and locate the subfolder with the GUID as the name. Delete the subfolder.
Go back to the SMC, and where the personality is listed, click on Actions | Delete.
So, both the actual files and the references are removed.