IT Specialist

I have installed Microsoft Office 2007 on a XP Professional machine. I have attempted to update Microsoft Office 2007 several times. Rebooted machine and still am unable to install MS Office updates for Excel, Powerpoint, Word,and the entire Office 2007 pack. It will not let me remove Office from Add/Remove programs. It prompts “Office not uninstall successfully.” When I click on Excel 2007 it wants to install and it errors out. Word, Powerpoint, and Publisher works fine. What can I do to successfully uninstall this software? Or how do I update the software on XP Office Professional machine.