Adobe Imageready CS2 problem?

The program Adobe Imageready CS2 was working fine for me then it came with the an error saying "Could not fully start the application. The Personalisation is invalid" I dont know what it means but It was fine on me and I havent got the full version of Photoshop yet but Adobe Imageready is like the free version of Photoshop with limited features and a few extra ones. Can anybody help me solve this. Thanks :)