deleted user definited fields

I am using OL 2007, single computer pst file.

I have many user defined fields that have carried over from OL2003 and
perhaps before. These fields are no longer of any use, yet I cannot seem to
get them deleted. I could not say in what way they were created, as some
date back 5 years.

In the view menu, I have used the Field Chooser and deleted those fields in
User defined fields in folder.

I have gone into the design a form, deleted the fields in the all fields
page for both user defined fields in folder, and in this item. On the all
fields page, there are several forms listed in the drop down box that I can
choose fields from. These forms no longer exist on my computer, so I'm not
sure why they are there.

I have several folders under contacts and have done the above to each folder.

If I simply open a new contact form and go to all fields, these old user
definited fields are back! I have no idea how to get rid of them permanently.

My contact form does contain a form region with some new user defined
fields, but none of these old ones. So please help......how can I get rid of
them?