autofill with wrong data - NOT password and id

nis version 17.5.0.127

xp version Build 2600.xpsp.sp3.090804.1435 (SP3)

firefox 3.6 and ie 8.0.6001.18702

google toolbar was loaded but uninstalled it on both browsers

 

here is an example page which fills in with wrong data

http://www.hgtv.com/hgtv-dream-home-2010-giveaway-enter/package/index.html

This site does not have an id and password to get here but this page has a fill in form.

Items like First Name - Last Name - Address - Phone get autofilled.

 

The fields get autofilled in but with wrong name - etc.  How can I change this to correct data.

I don't want to turn off this page - I can do that (and no fields are autofilled) - But how can I change it to fill the correct data.

I tried to click on each field and delete it the fill with correction but [is there a magic key stoke to save this data]

before I click on the [enter for a chance to win] button?