norton internet security 2006 upgrade questions?

greetings,

i was wondering if someone could advise me about a question i have about buying some upgrade norton software?

my father has had norton systemworks 2005 on his pc which is due to expire soon. he has asked me to get him norton internet security 2006 for him as he does not want norton systemworks again this year.

do i need to buy the full version of norton internet sec 2006 or can i buy the cheaper upgrade version even though he has norton sytemworks on his pc? will he still be able to use this upgrade software?

thanks for any help anyone caan give me and sorry if this has been asked before elaswhere!

 

I think you can only buy the SystemWorks 2006 upgrade

 

thanks alot for your help Firecat!