Yep The Registeration serial Number is the same on the Box as the system.
Begins with "CK"
i have not typed it incorrectly. I followed it exactly. and tried so many times with Firefox and IE. its not my PC.
am very disgusted with such an easy process. and that Sony does not even have record with these "CK" 80GB systems. I purchased it at Best buy 3 weeks ago.
Hmmm-it's July 2009 and Sony still hasn't addressed this "CK" issue...."invalid registration" response when you try to register online. It can't be very important or they would have fixed it by now as it seems to be a problem that's been around for a long time.
Maybe they are hoping your machine bites the dust and you have lost your precious receipt-which you MUST have in order to prove warranty dates. No receipt-no free repair...so sad!
I registered thru Sony.com under the electronics registration link (I think). There's other threads on this is if you feel like reading.