transfer activation

I purchased a new computer with was preloaded with NIS v19 and a 30 day subscription.  My old computer had NIS v17.I have the serial number but the email address it was registered with is gone and do not remember or have access to.

 

Need to transfer my old activation to my new computer.  The new computer has a new activation account with my current emnail address. 

 

How do I proceed? 

 

The Nathan support is useless for this and not having a number to call is very annoying. 

 

Kay