Does your serial number show on your account page?
https://www.adobe.com/account.html for serial numbers on your Adobe page... or
Lost serial # http://helpx.adobe.com/x-productkb/global/find-serial-number.html
Also, as far as I know, the serial number you enter when you install and activate an Adobe program is then encrypted, so there is NOT a plain text file that anyone may see... which is a security feature in case someone else has access to your computer