Disable Taskbar in Win XP

Hi

We run a small network in our company, with one server running SBS 2003 and clients running XP proffessional.

I have been told by my manager now that we need 2 computers at our security reception to just load a predefined website which will only show them the announcements. all other programmes should not accessible.

I am now wondering how could it be done. Presumenbly once they log in they should not see the taskbar or at least the start button. Then IE should open with the site we want them to see. How could this be done? Is it through GPO, regedit, maybe a logon script?

Thanks for any helps in advance