/moved to help
If you want alteriwnet to auto-update open up this file
in notepad and make sure "enable_updates 1"
If you want to uninstall MW2 you can just delete your whole "Modern Warfare 2" folder.
If you want to have a shortcut to it, right click on iw4mp.exe and roll over "send to" and click desktop, then you will have a shortcut for MW2 on your desktop.