Yes, I tried to install openoffice 2.1 tonight, it turned out a error message said that it cannot read openoffice.msi at \windows\installer blah blah... at the end of the installation, also, the silly message still came out when I uninstalled openoffice 2.0, then I searched through the OOoforum found this little toy:
http://support.microsoft.com/default.aspx?...kb;en-us;290301
it called windows installer cleanup (as u see, it's from ms themselves), and it works pretty well, all the installer rubbish kept in the database are now wiped off, nice and easy, just choose a invalid entry then click remove, you will need it one day I suppose:) good luck!
ps. attention, this is not a uninstaller, instead, it cleans the msi database in your sys, much like a registry cleaner, do not use it for normal uninstallation unless the program cannot be uninstalled properly by it's own uninstaller.