Alright thanks, i'll give this a shot, Thought i should mention a few things;
A) Primary Is DVI, Secondary screen is a DVI to AVG addapt.
B) While you were typing this out for me, thank you btw, I thought id give it a go and pull the good'ol Unplug and plug back in trick. Haha the flickering stopped. Pretty sure though if i restart the computer, it'll just happen again.
Also Messing with these settings the way you just told me, this wont effect my game play/Fps all that good stuff on my Primary screen will it? All it'll do is stop it from flickering - or will there be slight FPS lose?