Did you use the add/remove to uninstall it? If you did that allready,
Try Uninstalling it using the Registry.
Go to Start>Run> type in "regedit"(without the quotes)
Navigate to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
Right click on the the Uninstall key and select Export a box should appear save it somewhere you know. You have just Backed Up your registry by clicking the Export. Rember Before editing ot messing around with the Registry please back it up.
Now find your Microsoft2003 under Uninstall, and right click on it and press delete. I am not sure what is the exact name of the program because I don't use Microsoft 2003, I think tis called Microsoft 2003 Preium ot something like that.
Any help with the Registry please refer to this tutorial: http://www.bleepingcomputer.com/tutorials/manually-remove-programs-from-add-remove-programs/