We just tested an older version DriveHQ FileManager (Build 1021). It works fine on Windows Vista (and Windows 2008 Server). You can download it at:
ftp://ftp.drivehq.com/drivehq/drivehqsoftware/Old/6.0.1.1021_ForVista/
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The latest version DriveHQ FileManager supports Window 7 (Windows 2008R2) and higher operating systems (Incl. Windows 8, 8.1, Windows 10, and Windows 2012, 2012R2...)