Since you have an upgrade version of Office 2000, you would need the full Office 2000 program in order to install it on your laptop, not the upgrade version.
You're best bet is to "include Office 2003 @ $250" with your new laptop, that way you have the "original" version (I take it, it will be pre-installed on your new lappy? do they also give you the "full version" on disk?)