Other than running through painful faultfindings,
I'd try booting one stick of ram at a time, can't always rely on memtest I'm afraid
possibly a new install of (Pain in the Harris I know) Windows
Your cpu fan hooked up ok and spinning well?
Aah, WoW, the pain in the Harris,
I had similar with the Gf's new build, (She Did have one bad stick of Ram) But I also had to do a full re-install of WoW and patches for her as well,
As DRakoes asked, any other new additions at all?
Thousands of the damn things, But googling kernel error xx45633, this that and the other, just pointed out it being a memory issue luckily hers is a mirror build to my rig, so I swapped parts out to test on my Rig,
psu, gfx card ( Tried 4 different cards)
memtest showed all good,
was going out my mind, then thought I'd test it with my ram, but before I did that, I tried the onestick boot and first stick just endlessly post/fail/post/fail tried the other stick, played WoW, surfed net no problems, Rma'd the bad stick and The Gf's pc is shiny now
just finding the problem was a pain hehe
It was until I found the problem lol, not least because it was a birthday gift, and her big day was fast approaching,
with a less than pleased Gf in the way, the pressures on to find the problem lol