the game wouldn't open at all without giving me a fatal error pop up.
Fatal errors can have a bunch of different meanings.
Tougher to diagnose without the exact crash message, but here's a few tips to get you moving along.
C:\Users\xxxxxxxx\AppData\Local\TheParasites\Saved
Check this folder for the crash logs, this may help identify the exact cause of the crash.
You may also try deleting this entire folder if you don't care about your save games, see if a total reset helps or not.
Otherwise, here's some common software related issues that may resolve your issue.
Run the redist found under Engine\Extra\redist\en-us\
Update to the latest & supported DirectX package
(press the Windows key + R, then type "dxdiag" - this will show you the supported version of DX on your system.
Update Microsoft Visual C++ (search vcredist)
Update your graphics driver
If none of this works, it's either a bug on the developer's end, or you have an odd hardware issue.