Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
You need origonal disks, and the key, the product ID is of no help.
If office was provided when you purchased the origonal PC then thats likely to be an oem version and that is not transferable to a new PC
There are no official downloads for Office 2000. Office2k is not fully win7 compatible, allthough most problems are with outlook