I have read about the infamous VSTA error and 1603 error during installation. I am also receiving this error message when installing the 64-bit edition on Windows 7.
I am logged into my computer with administrative privileges. I have also tried right-click "Run as Administrator..." on setup.exe
I tried uninstalling Microsoft Visual Studio 2005 for Applications.
NOTE: I was not able to find any key in the registry called HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\VSTAHost
I have tried manually installing Microsoft Visual Studio 2005 for Applications from the PreReqs folder.
All to no avail. I have attached the installation log file.