Forget that...
http://www.openoffice.org/An entire free OFFICE suite, just as good (perhaps in some ways better) as MS Office, and it runs on all platforms (though the Mac OS X version is in beta and only runs under the X Window system, a Linux thing, that takes a bit of technical knowledge, the Linux and Windows and BSD versions work perfectly).
Includes Spreadsheet, Presentation, Text (like Word), and web page composers.
If i didn't already have Office 2000 I'd have downloaded that on my computers. My fathers laptop doesn't have enough hard disk space for MS Office, so I put open office (like 1/4 the space) on it instead.
It also opens all the MS Office documents like PowerPoint and Excel spreadsheets (and .doc!)