Links from Addresses on Web Pages Won't Go to Outlook

[Big V]

I used to use Outlook Express, but upgraded to Outlook. However, now when I
am on a web page, and I click a link for an email address, a box opens for
Outlook Express, and asks if I want to change it to be my default. It won't
let me send the email using Outlook, just Outlook Express. I don't want to
get rid of Outlook Express because it has a lot of old email I may want to
refer to in the future. How do I fix things so that when I click on an email
address on a web page, it will open to Outlook, and not Outlook Express?
Thanks much.