If you no longer have the installation files, you can go to Micrsoft's Office Download page, Office 2003 Service Pack 1, and download Office2003SP1-kb842532-fullfile-enu.exe

http://www.microsoft.com/downloads/d...4fc47#filelist

Office2003SP1-kb842532-fullfile-enu.exe: Download this file if you do not have access to your original product CD-ROM or if you have experienced problems installing the Office2003SP1-kb842532-client-enu.exe file.
It is recommended that you quit any programs you are running.

In Windows Explorer, double-click the .exe file that you saved to your hard disk drive, and follow the instructions on the screen.