Altiris report showing two MS Office version in the same machine.

Hi Guys. Please, I need help to know why the Altiris Report is showing two MS Office version in the same machine. Where the Altiris take this information in a machine with Win XP and where the Altiris take this information in a machini with Win 7? For example, a machine with MS Office 2007, I remove that MS Office version and I install the MS Office 2010. When I receive the report this machine, show me that I have two MS Office installed in this same machine. Thank you.