I am facing a bit complex issue here. I am getting Error 8007066F after office update. I thought this would be fixed by performing the update back but still the same error persist. I cannot find any relative fix for that also. I am have installed both Microsoft Office 2003 and Microsoft Office 2007 on my system. Office 2007 was a trial. Later on I directly upgraded to Office 2007. Then I also upgraded my OS from XP to Vista and such error appeared. How can I fix them.