Welcome to TSF.
Run TestDisk again, but follow these steps:
A. At the first window, select
No Log and press the <
Enter> key.
B. Select which drive to analyse, choose
Proceed and <
Enter>.
C. Select partition type Intel if its a PC then <
Enter>.
D. Choose
Advanced > press <
Enter>.
E. Choose
Boot > press <
Enter>.
New screen - please post back with a screenshot.
How to post a screenshot.
Also - post a screenshot of Disk management with the USB stick connected.
(Right click "My computer" > choose "Manage" > Disk Management)