Question about Outlook Express

I have successfully removed a name an email address from the contacts folder,
BUT it is nto removed from the drop down box in the address bar "to" when I want to send a new email.

In case this doesn't make sense, let me explain:

I have removed Helen Brown from my contact list and when I wish to send an email to anyone at all whose entry in the contact list starts with "H" then the drop down box that imediately shows (to save me having to type the full address) not only shows other contacts whose entry starts with "H" but it still shows the entry for Helen Brown, which I had deleted from the contact list for my Inbox.

Please: How do I remove the name from the drop down box ?

Thank you in anticipation for your help.