I play a lot of zombies on COD black ops for the xbox 360

For some reason i keep getting these horrible spurts of lagg when i have really low ping and its not like regular lagg all of a sudden my screen will freeze then ill b moving again for about 3 sec and then all of a sudden ill b at the same spot i was when it first started to freeze its really...

I cant get the launcher to work i downloaded the .net framework thing and now it says unable to find a version of the runtime to run this application. All i wanna do is play and it seems so complicated do i need to dl all 3 of those .net framework links or what

Why is it when i try to make a game account i fill out everything and click on submit and nothing happens