Error! /Check activation.

[gogaming]

When I try to open an ebook thru Overdrive.com, I get this error message. I'm logged into Acrobat so what does this mean? What do I do about it?  I can't read any books. I am using a PC with Windows 7, laptop.  Also using Overdrive.com to access my library's ebook program. I've been reading books this way for several years. This problem just started recently.

[Test Screen Name]

Overdrive doesn't use Acrobat so far as I know, but Adobe Digital Editions.