PRS-T1 Can't transfer anything

Hi,

I have a problem with my reader : When I plug it on my computer, even if I turn it into data transfer mode, I can't transfer anything on it. My computer seems to detect only de "SETTING (K" device. I have another one that appears (E but it's empty or my computer tell me to reformat it.
I tried to transfer things with Reader for PC, I tried with Calibre too, but it's like if they don't detect my reader anymore. I even did a Hard reset on it as Sony told me to do but it didn't change a thing except that now I don't have any book on it...

Can anyone help me?