Sounds like it may have either been a bad install or you were doing too much while trying to play the game when it saved. Reinstall the game is the first step I'd take.
As for the SP missions, I think you have to play past the tutorial (first Russian mission) first before the other campaigns unlock.
The alpha and omega answer is to play multiplayer only, single player gets old really fast and you will actually learn far more in multiplayer matches.
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