My Modern Warfare 2 Game Wont Let Me Play... Please Help!!!

I can't seem to find a cheat on how to level up in modern warfare 2.

Here go this site CODES

In that site, you will see all the cheats that are available for the modern warfare 2 game.
Goodluck, Hope my solution will Help. Please give some feedback regarding my solution
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sometimes if you are playing COD4 then switch a game to MOD WAR 2, i have had the same problem, to solve it just take out the router wire and let it reset this should solve the problem.

try telling a friend online to invite u to a party then tell him what game to play

to enter the code for modern warfare 2 that can be found at the back of the disc case please follow these steps:

1. connect to xbox live
2.play the game
3.there is an option for redeem the code in the game once the game load up

you need to contact sony online where you go your account by phone they will help you

the person that set up xbox live will know info you looking for and is your xbox set up for children as it wont play as it is an adult game,change your console settings for any game to play.Hope this helps you get mw2 working as it is an awsome game online

Your PS3 probably doesnt have the right software for the game

make shure your game is not messed up

Acording to this there was a patch that went out in november you may need to update your ps3
http://www.joystiq.com/2009/11/12/everyone-rush-multiplayer-returns-to-ps3-modern-warfare-2/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+weblogsinc%2Fjoystiq+(Joystiq)

had the same issue.. quit the game and reboot your ps3.