Vista Ultimate Upgraded from Home Premium fails to install Virtual Server 2005 R2 SP1

I have a Vista x64 Home Premium that came loaded with software from the manufacturer that I would lose if I were to overwrite it by a new installation from my MSDN subscription version of Vista Ultimate.


If I install Vista Ultimate as a brand new installation, Virtual Server installation works fine.


But if I install Virtual Server 2005 R2 SP1 after I upgraded Vista Home Premium to Vista Ultimate, I get the following error at the last phase of the installation: “Windows Installer has stopped working” and then it sends to Microsoft the attached 3 files.

Any idea why the upgraded version fails whereas the brand new installation does not?
 

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