I had a look at the compatibility mode possibilities that were suggested, but I can't even investigate that option if I can no longer install Photoshop CS3. But again - where is a live technician when you need one!) Foolishly, I forgot to first deactivate my Adobe products. (This is only part of my current Adobe problems - the other problem was that my other computer (Windows 7) that ran Photoshop and InDesign was getting really scratchy and I reinstalled Windows 7. But I prefer to have it on C: and haven't tried that solution. Photoshop was installed on my C: drive and I've wondered if installing it on my drive partition might work. Maybe doing that image triggered Photoshop into thinking I was trying to clone the installation to install on a third computer? But that would be crazy. The only thing I can think that could have precipitated the problem was that earlier on the same day Photoshop died, I had installed and ran Acronis True Image. I'm using Photoshop professionally and this is a serious business disruption for me. This is why no longer having access to a live Adobe technician is a big problem. So I imagine that, as far as Adobe is concerned, I've used my activations up and can't do any more. After Photoshop stopped working with the licensing message, I was unable to start it again to deactivate the licence before uninstalling. If I manage to reinstall Photoshop, how will I activate it? I have the program registered for two computers, so that's all my activations used up. Both times I've got a message saying it was only able to install one shared component, but couldn't install Photoshop CS3 plus other shared components. I've now uninstalled and attempted to reinstall twice. The message also said I had to uninstall, then reinstall. Photoshop CS3 suddenly stopped working on Windows 10, with the message: 'licensing for this product has stopped working'.