I am running Windows Vista, and the drive is a 3Tb Intenso drive and is assigned the letter "I".
1. The very first thing I did was the chkdsk and this is what I got:

2. Then I opened TestDisk, chose the PhysicalDrive, and selected Proceed:

3. I chose Intel:

4. Then Analyse:

5. This is what I got so I started a Quick Search:

6. And I got this after it was done. I continued:

7. Then I pressed Enter:

8. No partition was found so I started a Deeper Search:

9. This is what I got. I continued:

10. I got this and pressed Enter:

11. I quit to the main menu:

12. Chose Advanced:

13. Then I chose Boot:

14. I got this and chose Rebuild BS:

15. And I finally saw some folders and files present on the disk. So I pressed Y:

16. I then chose List:

17. Then with the right arrow key I entered the first visible folder (XXX TO FIX):

18. But nothing in that folder was found. (I tried the other folders and the same happened):

When I got back to step 14 and Rebuilt the BS again, and then on step 15 I chose "N", it would show me a list of other files and folders that weren't present on the previous list. And none of the folders had anything found in them again.
So I'm stuck here

Many thanks in advance.