One of the open source office suites should work for you but just for kicks I just installed Office 2000 on a machine running Win 8 Pro using compatibility mode for Win XP (right-click on setup.exe, Properties, Compatibility, Select Compatibility Mode for Win XP SP3). I also ran the installer as Admin.
I didn't do extensive testing and I only tried Word, Excel and Power Point but all three opened up fine and things seemed to work OK. I could do things like create a new file, save it to disk, re-open the file, access files on my network, spell check, change formatting, copy/paste, print, open the VB editor in Excel, etc...