Finally found the Cause of CTD
 

Finally I believe I have nailed the cause of the annoting CTD's, a faulty ram chip, took one of the 2 512mg I have out, and since then (Sat) not one crash.

Good program there:

http://www.memtest86.com/

Were them both the same mark and model?
If not, emember that with RAM, issues many times it's not that a chip is faulty, but that 2 or more of them don't "carry on well" between themselves... If they are not exactly the same, many times it's a matter of trial and error before you find 2 chips that work well together...