I have got a new laptop (an Apple MacBook Air 11") and after installing BootCamp, Windows 7, VB6, VS 2005, 2008 and 2010, yesterday I noticed that when loading MZ-Tools 3.0 for VB6 , it prompted to repair Visual Studio 2010. I had received the same or similar issue from 2 or 3 users these last years that I never knew how to solve, so I could only recommend to repair or reinstall Office, VB6 ,etc. Today I have investigated more and it seems that there are multiple causes but one of them documented