Norton AV 2005 Key not workign for Norton AV 2010

All,

 

Up until today I have been using Norton AntiVirus 2005. 

I decided to download Norton AntiVirus 2010.

The download of the 2010 version went fine as

did the uninstall of the 2005 version.

 

I am now in a trial period for 15 days until I either "Buy it"

or enter my Product Key to activate it.  My expectation was that I would

be able to use the Norton Anti Virus Key given to

me when I bought Norton AV 2005.

 

This is a 25 character string, in groups of 5 with the groups

separated by a "-" character.

 

The Product Key field in the activation form will not accept

the Product Key that I have.  It will not allow me to type the characters

in the key.

 

I logged into my Norton account and there is no record of my

Product Key when I originally purchased Norton AV 2005 in March '05.

(I have all purchase details on file myself.)

 

Is the expectation that my Product Key should work valid?

 

Can anybody shed any light on what is the problem here.

 

Regards