Blank screen and crashes Digital editions

I had a hacker in my computer (Your worst nightmare of Nightsoft).

I had to reinstall Adobe Digital Editions on my Windows 8.1, but now I only got a blank screen and then it crashes.

I can''t even open a trial book of Adobe anymore. I don''t know what to do anymore.

Please help me!

I just have downloaded the newest version 4.0 of Digital Editions.