I think what andro55 says is that you should right-click the setup.exe file and select the "Run as Administrator" command from the context menu.
This is for some reason sometimes gives a different result then just being logged in as a user with administrator rights.
Windows rights are a bit of a mystery to me, but I had cases when I could run something properly only by using this option.
Maybe the reason is that the given program may need administrator permission at some point while it runs. If you run it as an administrator, you give all that permission to it in advance so it can complete.
This is just a guess so if anyone know please correct me.
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