A little hope
Tests with Furmark and Prime95.

 - Testing Windows bare-bone: 30 Minutes stress, no freeze.
 - Installing an Anti-virus and some software, restarting computer.
 - Testing with Anti-virus and some software (No drivers installed): 30 Minutes stress, no freeze.
 - Installing audio drivers, restarting computer.
 - Testing with the audio drivers: 30 Minutes stress, no freeze.
 - Installing the latest graphic drivers from EVGA's website (without 3d vision since I don't use it), restarting computer.
 - Testing with the graphic drivers: 30 Minutes stress, no freeze.
 - Configuring Windows to my liking and installing more softwares.
 - Running a 20 hours long CPU stress test (Prime95). Will see the results tomorrow.
 - Still working. No freeze. I'm going to do some more "real-world" tests before raising the victory flag.