|"When i play games i like to listen to music, so i have my speakers and itunes in"|
That could very well be part of the problem. Try NOT using iTunes. In fact, try disabling ALL unnecessary background programs so that they don't interfere with your gameplay.
"i've seen on a lot of questions ask, people asking for 'specs' i don't know what mine are sorry"
You have no idea which video card, how much RAM or which processor you have? Do you have an OEM system (Dell, eMachines, Gateway, HP/Compaq, SONY, etc)? If you do, post the model number...one of us will look up the specs for you.