Are you saying that you have duplicate movie files or duplicate entries in the database. If it's duplicate entries then choose grid view and highlight the duplicate entries with CTRL and LEFT CLICK MOUSE then choose delete from the top MAIN menu Did you choose to change the drive from N:/ to H:/ because mapped drive can be whatever you make them in Windows Hope this helps
Make sure you backup the database before hand Always backup the database before any major deletions FILES-DATABASE FUNCTIONS-BACKUP DATABASE If I do any major major tidy up work then I make a copy of the covers, fanart and people pictures as well