Can't find the main campaign in Call of Duty Modern Warfare II

Been playing Call of Duty Modern Warfare II but had to stop. I cannot find the main campaign. All I see is the icon that represents I think one of the add-ons that gets installed.

Never ran into this problem with a game before. It's stupid.

Thinking of installing just Call of Duty Modern Warfare and playing that and hopefully none of these 8 or 9 add-ons will not be there.

@357mag: Have you tried uninstalling and re-installing and double checking all the addons the campaign pack was confusing at 1st because it had 1 campaign pack then a 2nd pack with single and multiplayer pack?