MacBook random shut down (again)

My MacBook has been randomly shutting down for the last week, regularly but unpredictably. It's a number of years old at this point, but has rarely given me problems. The battery is long since dead, so I have had to have it constantly plugged in. I've tested with other adapter cords, but the shut-downs still occur. I anticipate it must have something to do with overheating? Any insight for how I can fix this issue, or whether doing so is even worthwhile?

Phazon UK wrote:
Would I be able to remove iTunes from my Mac and reinstall without losing anything like library settings, playlist, and iPad/iPhone settings and backups?
yes. click here and follow the instructions. get a fresh copy of iTunes from here: http://www.apple.com/itunes/download/.
JGG

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