Congrats, probably the optimal solution. For future reference:
There are reliable 3rd party software repositories who host the original installation disks. Shipped with a trial access licence code, tehy should run fine and eventually accept your access key. Forget scratched CDs.
https://www.softlay.com/downloads/microsoft-office-2003
https://m.majorgeeks.com/files/detai...ce_pack_3.html
https://download.cnet.com/Microsoft-..._4-170478.html