I just bought a new Desktop computer. All of my old computer files (documents and pictures) were transferred to the new computer. The old computer had Photoshop Elements 5, 7, and 10 loaded on it and I have the software disks. I know you can only install on just so many computers. Can I install any or all of the previous (Elements 5, 7 or 10) software disks on my new computer? Also, I purchased Elements 12 sometime back but have not installed it and I don't readily find the new activation code. How do I get a new activation code number? I had PS Lightroom 3 on the old machine as well, can I use that old software on my new computer? Thank you so very much for your help!