Is it safe to delete older Nero Versions files and folders?

I am presently running Nero 12 Platinum. While doing an Explorer search on my hard drive, I find many files and folders that are from previous versions that were not deleted during installation of subsequent versions. As best as I can determine, the vast majority of these files are in C:\Users\...\AppData\(Local and Roaming\(VirtualStore)\(Program Files,Program Files (x86). It appears I am facing an imminent re-build. But before I take such a drastic measure, is it safe to delete these files and folders that reference previous versions? Previous versions: Nero 8, 9 and 10. Dell Inspiron, Windows 7. Thank you.
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