I have had Adobe Reader installed for several years withour any problems like this. Now when I open a pdf file on Internet to read, it times out with a message (Adobe Activation - requires administrative rights to this computer) and than shuts down. The message say: "log in as adminstrator and try again or contact your system administrator". Well, I am a single laptop user and also the system administrator, I suppose, and I have not my computer set up to log in as an administator. How do I change Adobe Reader so it allows me to use Adobe?
What is your OS?
What is your Adobe Reader version?
Do you have any other Adobe products installed, e.g. Acrobat?
Can you open the standalone Adobe Reader by itself?