I'm new here so I've taken a look at the three dumps from 2 years ago[!] and the one thing they all have in common is unexpected page faults. Two have 0xc0000005 exception codes - that's a memory access violation, and the third is a page fault in a non-pageable area. To me, they all point to RAM, but I see you've replaced the RAM. Is that with new RAM? Are you absolutely sure it's compatible RAM??