First thing, thanks a lot for your help and patience, Todd.

So :

1) Remove LV !!Warning!!
There are no NAS LV.

For info, i've done a complete delete of Unit when migrating from 32bit to 64bit.

3) Memtest, i've done this test too before, just after the fail update on DOM USB (4 hours without any problem)

4) I 'll try the Demo CD as soon as i can.