Word and Excel are components of the Microsoft Office suite. They are not built-in parts of Windows. To install them you need a Microsoft Office CD. Did your old computer come with one? If so, you should just be able to put it in and follow the instructions (then uninstall it from your old computer so you don’t violate the license agreement).
If not you will either need to purchase Office or use an alternative. OpenOffice.org is a popular one. It is (mostly) compatible with MS Office document formats and works well for most common tasks. It is also completely free and can be downloaded from that website.
If you want to complicate things, you can open Start / Settings / Control Panel / Add/Remove Programs, click Add New Programs, and follow the yellow brick Wizard.
Or you can simply insert the CD (I assume you’re using a CD) and let it autostart. Even though Win2K is built on NT, for most purposes the interface is pretty much the same as Win9x—and where it differs, it’s usually a matter of an option being in a different location, or being “enhanced” with options that may be intimidating for someone who’s used to the previous versions.
If you are encountering specific problems, post them and someone should be able to assist you.
(I see that Duckster has beaten me to the pinch while I was previewing. Oh, well, I’ll post this anyway so it won’t go to waste.)