In IE8, click Tools -> Internet Options. Then under Browsing history click the Delete Button, then check Temporary Internet Files, Cookies. Form data and Passwords are optional.
note:- if you clear out the form data and passwords, this will clear 'all' saved passwords.

If the above does not work, then you might have to clear out your files in a different way, try the following…

1. Load Internet Explorer and go to the www.tab.co.nz website
2. From the top menu bar (located top right) click on the 'Tools' menu item, a drop down list will appear.
3. From the drop down list select 'Developer Tools'. A new window will load.
4. In the new window click on 'Cache' from the top menu, a drop down list will appear.
5. Click on the following, selecting 'Yes' if it asks you if you're sure that you want to do this:
                - Clear browser cache
                - Clear session cookies
                - Clear cookies for domain
6. Close the 'Developer tools' window.
7. Close Internet Explorer, then reload it and go to the www.tab.co.nz website and try and login

If you are still having issues, please email internet@tab.co.nz with as many details as possible, including any error messages you are getting and your username.