maybe the programming language is different. so, MS do not worry about the virus because virus is specific. for example, windows virus will not affect mac os pc because the virus is unreadable. well....that's my point of view.

as i said earlier, as long as the x360 cannot understand what the heck of "the virus is trying to say", the x360 cannot be infected. during my university life, we learn how to create a virus. the most important thing is the programming language used by the virus must be understandable by the targeted hardware. and i re quote the example that i said earlier, a windows virus cannot affect a Mac machine.

so, i think....just enjoy your games to the fullest

just sharing info. hehehe