error when trying to install Word 2000 on new computer (XP)

I bought a new laptop (Micro Express) but because of work constraints it had to be XP. I bought it with XP Home on it, but I couldn't have them also install Word because they only offered 2007, and I need to have an older version.

I own 2 copies of Word 2000, one of which is on my old computer and one of which is not on any computer. When I try to install either one I get this same error message, "Windows files must be installed for your installation to proceed. Insert your Windows XP Professional Service Pack 3 CD now."

I have tried typing this error message in Google, but I got only 3 matches that I didn't quite understand and did not seem to have anything to do with Word.

I didn't think you had to have XP Pro to run Word 2000. Does anyone know what is going on?

Thanks, Maro