reinstall office 07 for xp pro

I am unable to boot into windows xp pro. Not in safe mode, or in choosing the last working configuration, so I am starting a clean slate. I purchased the computer from a third party with Office 07 preinstalled but with no discs or product key. Is there a way to reinstall my copy of Office 07 once I reinstall Windows XP Pro?

If it makes a difference I am currently on the same machine running Ubuntu 12.04 that was booted off of a flash drive.