If you can use iPhoto, you have a Mac, because I’m pretty sure it’s not available for PC users. Apple’s new program, Photos, replaced iPhoto back in late 2014. I suppose PC might also have a program called “Photos” (not the most original name in the world).
But it is sounding like you are on a PC… generally speaking, if you have a start menu in the lower left hand corner and no menu bar on top of your screen, you are on a Windows computer (which could be actually made by a number of companies like Dell, Microsoft, Acer, or Lenovo). If you have a menu bar on top (with a little apple with a bite in it in the upper left hand corner), then you are on a Mac. If you are browsing the internet with Internet Explorer or Edge, you are on a Windows Computer; if you browse with Safari, you are most certainly on a Mac (if you browse with Chrome, you could be on either).