I have been running the Microsoft Windows office 2010 Pro Beta version until yesterday. After the official release of Microsoft Office 2010, I wanted to uninstall the Beta version but it would not uninstall. So I tried to install the new release over only to be greeted by an error message asking me to remove the pre-release or beta version first. Nice!
Luckily I remembered trusty old Windows Installer CleanUp Utility. It removed beta version in a jiff and now, I am enjoying the all-new Microsoft office 2010.
Windows Installer CleanUp Utility is a great utility to have in your toolbox. Anytime you are having an issue uninstalling a program, use this utility.