I have purchased photoshop elements 12 and installed it on my XP computer including entering the serial number during installation. On attempting to run the program and choosing "Editor" I am faced with the message that my trial has expired. I am unable to progress any further even when trying to sign in from the prompt from elements that infers that I need to "Buy" the program. Does anyone have any suggestions that will solve this problem please. I have also tried registered the serial number via the Adobe web site and this does not show in "My products" listing.