You are having issues at stock settings. So you need to really establish a baseline before you do anything else.
First of all you should know that i7-3820 only officially supports DDR3-1066, DDR3-1333 and DDR3-1600.
Speeds above 1600 usually require some extra voltage to the IMC (Integrated Memory Controller).
Lets start by disabling XMP and setting your RAM speed to 1600.
9-9-9-24 2T should work fine. See if it is now stable at that speed.
Just because your RAM kit is specced for 2000MHz does not mean your CPU's IMC can do 2000MHz.
If you are faced with the windows repair message then data is corrupted. That means corruption of data while in RAM or corruption of data while writing to HDD.
So the second thing you need to do is check your HDD. Do you have a spare HDD/SSD for testing?