Unfortunately I've done all of that already, but I have a 64bit system.
The problem lies solely with the jack input, from which I would like to use my headphones. Regardless of wether or not my headphones are plugged in, the sound comes out of the monitor, so it DOES work but doesn't want to use my headphones. However, the only audio driver that is currently installed, is the NVIDIA HD Audio, which goes from my hdmi to the monitor. There is no Realtek driver installed and the driver setup gives me the error code every time I wanna install said driver, so even if you find a compatible driver (I'm pretty sure I was downloading the compatible one already) I'm not sure if it would let me install it