Adobe Application Manager is needed to start your trail.

Hi guys,
My Adobe Illustrator CS5 has encountered a problem. As per the screenshot mentioned below it is likely to be a fatal error and my currently installed Adobe Illustrator CS5 is invalid. Should I remove it and install a new one?
Please help.

Adobe Illustrator CS5
Adobe Application Manager is needed to start your trail.
Adobe Application is needed to resolve this problem. However, it is missing or damaged.
Download a new copy of Adobe Application Manager from https://www.adobe.com/, or install this product again.
