I have a dreamweaver disc but no packaging. I want to de-activate from one computer and re-install on another. How do I find out my Serial Number.
You may try your luck by contacting Adobe Support no one would be able to help here.
If you eveer bothered to register, it's listed on your account. if not, then there is nothing anyone can do and you need to buy a new license.
Have a look at the followig document. This should help you locate your serial number: http://helpx.adobe.com/x-productkb/global/find-serial-number.html