Did you mean OfficeXP2003? Im going to assume you have Windows XP with Office XP installed with it.
If this is a bundled product (purchased with comp) you can call the manufacturer or even Microsoft. They might be able to help you.
* If it WAS working, try using System Restore unless disabled
* If it came bundled/preinstalled, some comp vendors provide a way for you to do a "repair" rather than a complete overwrite while in recovery mode. "Recovery mode" is usually accessed on bootup before windows loads.
Failing that, if its been installed and working - but only erroring lately - you can use some freeware software to "find" your key on the machine if its still there.
Failing all THAT you could always go the illegal route.
