Cant run prime on standard clock

[Numbnuts]

I have a q6600, an arctic cooling 7 pro, 2 gig of geil pc6400c4 800mhz and an asus pk5 mobo.
If i run prime four times for quad core it keeps stopping straight away and saying something about its at .5 and expects below .4 or something.
Can anyone please help me as i want stability

Thanx for any help

 

[Numbnuts]

i think its the ram because i just run the test overclocked, and the cpu is fine for the 5 mins i tested it for.
What could the problem be if it is the ram