Go into your nitepr menu (before logging in) and press the R trigger twice (i think) until you see an option at the bottom of a list entitled corrupt PSID. When you press this you should see your memory stick light (the orange one) blink once or twice (this just means it worked). Then go back to socom and create a completely new name (not one that you have already created), it doesnt matter what the password is. Then log onto the server like you would normally do and you shouldnt get the -952 error. Then just play on your new account untill your original name is un-banned.