Turbo Delphi Explorer fails to install on Vista RC 2

I spent few hours today trying to install Borland Turbo Delphi Win32 into my Windows Vista RC 2 (build 5744), but I couldn't install the product because the installer runs into trouble with access rights to certain directories, which it however won't disclose. If you try to retry the operation, an internal error is raised. I give up; it's sloppy installation program authoring. But it just shows that developers need to pay attention to security.