I have exactly the same problem. My serial number is 17 digits which I downloaded from roxio's website. The roxio vista update installs then when you go to use a program it needs to 'activate'. This fails with the error 'Invalid Product Key'. In the knowledge base it instructs you to go through the manual activation method which unfortuately needs a 25 digit key. DUH.
Support told me to clean install using the procedure given.
HALF A DAY OF WASTING MY TIME LATER, it still wants a 25digit number. The patch is f'd which is clear but clearly the roxio team seem to believe that 17 and 25 are a match. The software is buggy and a disgrace to the programming staff, the QA department that released it and to the support team who clearly cannot get their heads around the fact that the software is broken.
I guess I spent my money and got screwed. Lets blame vista for roxio's problems.
That'll sort it.
