Hi Judithh121,
The procedure for moving a project:
1. Create a NEW folder on your desktop or elsewhere
2. Open PD10 with the project displayed
3. select File>Export>Pack Project Materials> browse to/for the New Folder and select OK.
4. the contents of your Project - all media data in the Tracks has been replicated into the New folder.
5. The New Folder can now be moved anywhere and will reopened with your project displaying, just select the pds file the New Folder contains.
You appear not to have created/saved your project correctly. You may browse, when asked by PD10, for the files and locate them on your HDD.
Dafydd