my computer has been exchanged new the disk , how can the audition CS6 continue to work?

Indeed, phone is likely the only way to solve this one.  However, you could TRY going to the www.adobe.com web page and click on the "contact us" link.

This will take you through a bunch of pages about what product you have, what sort of problem it is, etc. etc. but eventually you'll be offered a choice of an online chat room or the phone number for use in your country.  Note that the chat hours are restricted.

I've never tried this route so would be interested to hear if they can help you.

The other, fairly new way to contact Adobe is via Twitter where they are @AdobeCare.  I doubt they could help you directly since sorting out your registration would involve posting confidential personal info, but maybe they could point you in the right direction.

Again, I'd be curious to hear what response you get.