I've been using AF since 2009 and I've never had this problem. I just let it install where it wants to (never been given a choice or remember having one). The software gets installed to:
C:Program Files\Cloanto
C:Program files\Common
C:\Users\Public\Documents\Amiga Files
I would uninstall and re-install AF.
What edition are you using, Value or Plus?
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