Cannot access full book on Adobe Digital Editions

Hi there.

I am having issues accessing in full a book I purchased 2 years ago. It is an Adobe Digital Editions book (a dictionary) and all I can see is the front page but I cannot access the rest of the book or search it.

How can I access the rest of the book?

I also cannot remember my login details (nor do I remember ever setting any up). Do I need them for this?

I only have the a .acsm file saved on my PC.

Any help is much appreciated.