So, first of all, I'm sorry I didn't updated you guys with my pc's situation. I tried to fix those BSODs but it gotten even worse, up to the point where the system would just freeze or restart after a few minutes.
Secondly, for some reason my motherboard "was heating up" up to 120 degrees celsius, so I thought that I should just replace it with another one.
My old MB was not recommended for gaming, and my new one is. Continuing with this idea, the new MB arrived, put it in and... Voila! It works! No BSODs, no restarts, nothing!
I now know for a fact that a normal MB is not recommended for a "gaming" pc.
Thanks a lot for helping me, even though I was the dumb one here.