Activation server error

Hi,

I'm trying to authorize my computer (not an ebook or epub or whatever). But each time, I receive the Activation server error : E_ADEPT_REQUEST_EXPIRED... I have tried all the tricks : unauthorize the computer (it did not work unless I went in Run, regedit, etc. to delete the Adept keys), install the 3.0 version, unistall everything. I am at the end of options. Anything else I could try? My goal is to read the books I borrow from the library on my Kobo. I'm a little desperate at this point, and no support from Adobe. I have also tried the time thing, but everything is ok for the date, the time, etc. on my computer. Help anyone? 

Thank you!