MY CPU ISNT EVEN STABLE @ STCOK!!!!!

WTF ?

I dont have problems in gaming, but when i was playing GRWA2 and finished a mission , it came to window and crashed , then i ran it again and it was fine , but when i ran ORTHOS, i got this :

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Everything is @ stock settings , (like a new mobo)
 
well i did something now , i took out one of the sticks of the rams and ran ORTHOS, and it stopped , then i took out another one and when i turned on the PC , a screen came and said OVERCLOCKING FAILED ! ,Press F1 to resume (i think) , Press F2 to load Defaults ,_thats not the first time i have this error_ i pressed F2 ,it came to windows and i ran ORTHOS, it was stable , then i again put back one of the sticks in the slot and ran ORTHOS and it was stable , then i put the last stick of the ram in its slot and ran ORTHOS and surprisingly it was stable , so what was the problem ?