Ive run memtest for 50 minutes and it picked up 2003 errors on test 7 does this definatly meen that one of the memory sticks or both are faulty or is there anything else that could be causing the issue 
System has updated bios and latest drivers as its a new build.Memory as below in signature.

System has updated bios and latest drivers as its a new build.Memory as below in signature.
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before i realised DDR2 has to be in the same coloured slots.
but hindsight is a wonderfull thing but i still trawled through the forums and read to update the BIOS first because there were known issue with lower BIOS versions and certain types of RAM.