There is something weird, and I cannot realize what it is. I have already tested BabaCAD 2017 on several computers running Windows 7 Home Premium 64 bit and everything was fine. Maybe once more thing you can try, to go to properties of babacad.exe in explorer (Program Files/BabaCAD/BabaCAD) and select compatibility mode and try different options (vista, XP, ...), then restart BabaCAD 2017. It would be
pretty bad for you not to use a new BabaCAD 2017, as there are so many improvements and more better user interface in new version, but if not you must be satisfied with running old 32-bit version