It could be that you installed another version of BabaCAD after one already installed, and then it overwritten old version. Then, after you uninstall that last installed version, older one left in program files x86. Just delete that foldera nd it will be ok. BabaCAD does not install nothing but files visible in BabaCAD folder. That's why thumbapps.org reviewed babaCAD as portable CAD app. You can just copy installed BabaCAD to USB stick, and then you can run it from stick on any window computer.
If you have windows 10, did you try BabaCAD 2017, it's 64-bit and far away better than old 1.3.4 (32-bit) version.