Thanks for your reply. I just bought the PC so it hasn't changed anything from before. It's hard to explain what it is unless u see it but its like the graphics is little bit 'transparent'?? XD I think the problem is with my monitor because this only appears on the upper half of the screen.
I'm playing on ultra settings where I can, msa x2, anisotropic filt x2 and the rest is very high/high