Thank you Mr zag.
I should have run memtest prior to annoy people with a silly thread
I ran it overnight, but a within few secs it spotted an amazing number of errors.
It seems one of my ram sticks was the culprit, I also tried to test the motherboard slots, and the computer doesn't even power up when I'm using Dimm2 and Dimm4, maybe because of dual channel specs ?
As for CCC, I don't know if it's interfering in any way, didn't experience any BSOD come back for the last couple of hours.
So I hope it was just a ram stick issue.
Anyway, many thanks again for your help and time.
Have a nice day !
Edit: i'm not using Zone Alarm by the way, just Kav.