Honestly, it sounds like your computer had deeper issues going on if you had to format it afterward. FlutterMare is just a Unity game, we recommend checking the health of your hard drive.
Error code 0xc0000007b is an issue caused by attempting to run a 64bit program installed on a 32bit OS, so really the one who needs to learn about programming is you. Instead of blaming a porn game dev for your shitty handling of a computer (Don't run executables off your desktop is a pretty basic thing), learn more about your own hardware and software. Download the 32bit version.