When trying to install Microsoft Office 2010, you may get this error:
An Office 2003 installation on your computer is corrupted and setup cannot continue. Remove or repair the Office 2003 product and re-run setup.
To fix this Office 2010 installation error, uninstall Office 2003 before installing Office 2010. If you still have this error when running the Office 2010 setup, use Method 2 (Fix it for me, under Resolutions) in this MS kb article to remove Office 2003 completely from your computer.