Why can't I access to my ebooks in Adobe Digital Editions?

Hi,

I just downloaded an additional ebook for Digital Editions.

However, now Digital Editions is not working and I can’t have access any of my ebooks.

I don’t receive any error message but it’s simply not working.

Before doing that download everything was working fine.

Any idea of how this can be fixed ASAP?

I'm having training for ITIL certification and I need to have access to my ebooks ASAP.

Thanks.

Best,

Miguel