I have recently purchased a brand new computer which is able to play the blu-ra and stuff and this is like the HD computer. I am having the Windows 7 operating system installed in that. Well anyways, I bought this game and I installed that on my computer. Now when I go on to the main menu it is fine. But if I go to campaign otherwise something the lag is terrible. It is really bad, therefore what I am asking is, is there any technique of fixing the problem similar to the screen size or the graphics or something else? Please reply.