http://static1.squarespace.com/static/5134cdb7e4b021358bcf4aee/5576ee3be4b09c819cc3edb0/5576ee3be4b042423a39fd82/1433857595851/Windows+QTR+Quad+File+Location.jpg?format=1000w
You need to delete the files in the folder for your printer model (all these will/should have the .quad file extension). They should no longer see them your curves drop down menu after deleting these files (you may need to quit and restart the QTRgui).
Richard Boutwell