Possibly safe software, not sure on trust!

I have recently installed a third party software on my surface book 2 and after few weeks, I had to uninstall, as I had no more purpose left for it, but the problem is, whenever I restart my PC, the installer keeps kickking for installation of that software. So, I wanted anyone's help to get this file to be completed deleted from my PC; So, it cannot showup again. Please help!!