This is something I found happening too when I moved to Win7. It's the UAC being overcautious. You'll find that your content is installed and working quite happily. To get rid of the irritating messages go into Control Panel/User Accounts. Click on Change User Account Control settings and move the slider down one notch. It's set at maximum by default which is what throws up all of those messages. You'll notice that the second bar down is a darker line than the others. That should be the default but isn't so you have to set it manually. Change to that and reboot and you'll never see that message again.

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