Applied hot fix to my 2015 version. Everything was ok until I decided to install the 2017 version. DraftSight 2017 SP1 64-bit installer gives 1722 error when it tries to register FxVistaPreview.dll and the only option is to undo the installation. Now I cannot reload the old 2015 version either. After trying many things, I and my IT department are stumped. There seems to be a library dependency referenced by this dll that regsvr32.exe cannot reconcile. Has anyone else had this issue or know of a solution? My OS is Windows 7 Professional 64-bit. Installer log file is attached.