Your Office 2003 should comes with a Office Cleaning utilities. I've copy those files out and put together a zip file for download.
unzip the file to your desktop and run the exe file. This should clean up your old office without asking you for the cd. let me know if it doesnt work.
Does anyone know how to remove Microsoft Office 2000 without the CD's? I tried the Microsoft Office 2003 removal wizard but that too wanted the CD's.