Bill if you CS3 is an upgrade you will need to provide the serial number of the product the upgrade us for. For CS3 the would be any prior version of Photoshop registered to your account. You should be able to sign in to Adobe.com and use the My Products and services link to see your product and retrieve you keys. If your also a subscriber you need to use manage account then use Plan and Product lint the use the vied other products to get you old products. Version 10 is CS3. Click on and prior version in your account to retrieve your serial for that version. View screen capture in a new tab or browser window the site scale screen capture so poor there not readable.
