I tested it on both my laptop and my brother's computer and neither of them had any issues (laptop had an Intel HD 5500 at 1920x1080 and my brother's PC had a 1050 TI at 1440x900)
And I never used the hiresfix and the only startup parameter is -windowed (which removing it had no effect either)
Every time I try to run the game, it either
A) Runs in the very top left corner of the screen at a low resolution with a black box around the rest of it when I set my resolution to a lot lower than my native one or
B) Runs WAY too big to the point where only the top left corner is visible when...