https://community.landesk.com/support/servlet/JiveServlet/downloadImage/2-104823-57280/modelebl.png
You uploaded this image.
Try the following:
1. Open your template "Windows7_ImageDeploy_HII [...]"
2. Go to the section "Installation d'OS" --> Action "Set active"
3. There you have two textboxes: "Disque" and "ID de la partition" --> Set "Disque" = 0 (already done) and set "id de la partition" = 2
4. Save
5. Schedule Template again and try to setup a client.
On your attached image I see that the "id de la partition" is has the value 1 but you have to set there the value 2 because your os partition has the id 2. Thats why I asked you for the "list partition".