Very very seriuos Outlook problem PLEASE HELP

I have found many posting of the error occuring but none of them have
answered my situation.

System Specs:

OS: WinXP Pro SP1 (can't install SP2 until updates for CAM software
are created)
Office: Office 2002 updated (Server running Exchange 2003 Stand.)
AV: Norton Corp v8.0 updated

Situation:

Open Outlook/ create new mail / click the TO: button...
system waitings and reports "The remote Procedure call Failed" and
Outlook shuts down...
I know that there is no virus on this computer many different AV
products scans confirms this.

Thanks.

Audrius