My best advice I can give you is if the CD came with the computer. Save all word files in: 97-2003 document (.doc). All publisher files to: publisher 200 files. All excel files to: 97- 2003 work book (.xls) All power point files 97-2003 ptt. Doing this I have found even if you have Office 2010. I am able to open every thing in 2003, 2007, and 2010. The () show if you have file extractions turned on what it would show. Make sure you are not SAVING in template format. That does not always work so well. Also, when you install 2003, you have to uninstall 2007. The versions types are incompatible and will not able to both be on the computer.
Hope this helps, let me know if it does,
Nadia