Adobe Digital Edition freezes after downloading a book via -acsm file

Hello,

Three hours ago I have downloaded the Adobe Digital Edition (ADE) so that I can read a book for my studies.

I use Win7 on my netbook.

I fully authorized it, downloaded the .acsm file, unblocked it in the properties and opened it with the ADE.

A smaller window popped up saying: Fulfilling[book name] and a progress bar went up to 100%.  Then it dissapeared and the ADE froze in a fashion that it can be moved around and minimalized, but nothing else.

Eventually, after about 30min I closed it via task manager.

I've already spent three hours digging through the forums instead of studying so any help is appreciated.