I'm not sure what OS you're on, but following what the user above said should work. That said, I'm not quite sure how computer literate you are, so there's an easy way to find out if you are 32 or 64-bit. If you're on Windows 10 (which it looks like you are based off of the looks of the Window in WinRAR.), right-click on the windows flag > hit system > and it should tell you some of the details of your system, including your system type: