I am having the exact same problem!!! This is very upsetting! I was having issues with a few of my internet browser's functions. So I updated to the newest firefox. Then, out of nowhere, I couldn't access any of my pdf's. So, I tried to update adobe, and started getting this very same message. I removed all adobe programs off computer, re-downloaded, and still with this message. This is hindering my business. How do I get this fixed?
Since you both don't specify any information as per your OS version or Reader version, I can only assume that you are using an OS version that is not supported by your Reader version.
I am getting a very similar error when trying to use Google's Picasa 3.8 on Windows 2000.