Random BSOD's on self built computer BCCode 50,1a and 24 so far

Hello guys.
This is my first time on SF so hi.

I'm having a problem. I wanted to build my own computer with mid lvl hardware. Instead I found a 2nd hand computer from an enthusiast which had some hardware I wanted for an extremely affordable price. I knew something would be wrong with it so I checked it before I bought it and almost everything on it works good now.
The problem I keep running into are random BSOD's.
I've been googling around and run alot of tests and programs to try and fix it but the BSOD's keep coming up with different codes.

I'm running Windows 7. It's not the original OS but one from my other pc's.
The age of the hardware is unknown to me.
I've added the .rar file with the tests which the posting instructions told me to add.

Is there anyone out there that can put me out of my misery?