A family of Microsoft word processing software products for creating web, email, and print documents.
Check for multiple version of Office program under Start-> control panel-> add or remove programs. If you have any lower version Office programs like Office 2000 or Office XP, uninstall the programs from the list. Then restart the computer and try to open the word document. If you still have the same issue, remove and reinstall Office 2003 from the disk.
When you uninstall and reinstall Office 2003, the data and documents saved on the computer will be safe because they are saved on the hard disk.
Refer to the link to remove earlier versions of Office using the Windows Installer Cleanup Utility:-
http://support.microsoft.com/kb/290301
Note: Make sure you have the disk for Office 2003 before you uninstall any program.
Ganesh Kumar N